Install Roundcube Webmail on Ubuntu 18.04 with Apache/Nginx

Roundcube is a free and open source webmail client written in PHP. A webmail is a mail client in your browser, which means instead of reading and sending emails from a desktop mail client like Mozilla Thunderbird, you can access your email from a web browser. Roundcube functionality includes MIME support, address book, folder management, message searching and spell checking. This tutorial is going to show you how to install Roundcube webmail on Ubuntu 18.04 with Apache or Nginx web server.

Roundcube 1.4 Release

Roundcube 1.4 was released on November 10, 2019 after two years of development. This release features:

  • A responsive skin called Elastic with full mobile device support
  • Email Resent (Bounce) feature
  • Improved Mailvelope integration
  • Support for Redis and Memcached cache
  • Support for SMTPUTF8 and GSSAPI
  • Plus numerous improvements and bug fixes


To follow this tutorial, it’s assumed that

If not, please click the above links and follow the instructions to complete prerequisites. Note that if you set up your email server using iRedMail before, then you server meets all requirements and Roundcube is already installed on your server.

Now let’s proceed to install Roundcube.

Step 1: Download Roundcube Webmail on Ubuntu 18.04

Log in to your Ubuntu server via SSH, then run the following command to download the latest 1.4 stable version from Roundcube Github repository.


Note: You can always use the above URL format to download Roundcube from command line. If a new version comes out, simply replace 1.4.0 with the new version number. You can check if there’s new release at Roundcube downloade page.

Extract the tarball, move the newly created folder to web root (/var/www/) and rename it as roundcube at the same time.

tar xvf roundcubemail-1.4.0-complete.tar.gz

sudo mv roundcubemail-1.4.0 /var/www/roundcube

Step 2: Install Dependencies

Run the following command to install required PHP extensions.

sudo apt install php-net-ldap2 php-net-ldap3 php-imagick php7.2-common php7.2-gd php7.2-imap php7.2-json php7.2-curl php7.2-zip php7.2-xml php7.2-mbstring php7.2-bz2 php7.2-intl php7.2-gmp

Install Composer, which is a dependency manager for PHP.

sudo apt install composer

Change into the roundcube directory.

cd /var/www/roundcube

Use Composer to install all needed dependencies (3rd party libraries) for Roundcube Webmail.

composer install --no-dev

If you see the nothing to install or update message, then all dependencies are installed.

roundcube webmail install dependency

Make the web server user (www-data) as the owner of the temp and logs directory so that web server can write to these two directories.

sudo chown www-data:www-data temp/ logs/ -R

Step 3: Create a MariaDB Database and User for Roundcube

Log into MariaDB shell as root.

sudo mysql -u root

Then create a new database for Roundcube using the following command. This tutorial name it roundcube, you can use whatever name you like for the database.


Next, create a new database user on localhost using the following command. Again, this tutorial name it roundcubeuser, you can use whatever name you like. Replace password with your preferred password.

CREATE USER roundcubeuser@localhost IDENTIFIED BY 'password';

Then grant all permission of the new database to the new user so later on Roundcube webmail can write to the database.

GRANT ALL PRIVILEGES ON roundcube.* TO roundcubeuser@localhost;

Flush the privileges table for the changes to take effect.

flush privileges;

Exit MariaDB Shell:


Import the initial tables to roundcube database.

sudo mysql roundcube < /var/www/roundcube/SQL/mysql.initial.sql

Step 4: Create Apache Virtual Host or Nginx Config File for Roundcube


If you use Apache web server, create a virtual host for Roundcube.

sudo nano /etc/apache2/sites-available/roundcube.conf

Note: If you followed my Postfix/Dovecot tutorial, a virtual host already exists. you should edit the following file.

sudo nano /etc/apache2/sites-available/

Put the following text into the file. Replace with your real domain name and don’t forget to set DNS A record for it.

<VirtualHost *:80>
  DocumentRoot /var/www/roundcube/

  ErrorLog ${APACHE_LOG_DIR}/roundcube_error.log
  CustomLog ${APACHE_LOG_DIR}/roundcube_access.log combined

  <Directory />
    Options FollowSymLinks
    AllowOverride All

  <Directory /var/www/roundcube/>
    Options FollowSymLinks MultiViews
    AllowOverride All
    Order allow,deny
    allow from all


Save and close the file. Then enable this virtual host with:

sudo a2ensite roundcube.conf

Reload Apache for the changes to take effect.

sudo systemctl reload apache2

Now you should be able to see the Roundcube web-based install wizard at


If you use Nginx web server, create a virtual host for Roundcube.

sudo nano /etc/nginx/conf.d/roundcube.conf

Note: If you followed my Postfix/Dovecot tutorial, a virtual host already exists. you should edit the following file.

sudo nano /etc/nginx/conf.d/

Put the following text into the file. Replace the domain name and don’t forget to set DNS A record for it.

server {
  listen 80;
  listen [::]:80;
  root /var/www/roundcube/;
  index index.php index.html index.htm;

  error_log /var/log/nginx/roundcube.error;
  access_log /var/log/nginx/roundcube.access;

  location / {
    try_files $uri $uri/ /index.php;

  location ~ \.php$ {
   try_files $uri =404;
    fastcgi_pass unix:/run/php/php7.2-fpm.sock;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;

  location ~ /.well-known/acme-challenge {
    allow all;
    deny all;
  location ~ ^/(bin|SQL)/ {
    deny all;
 # A long browser cache lifetime can speed up repeat visits to your page
  location ~* \.(jpg|jpeg|gif|png|webp|svg|woff|woff2|ttf|css|js|ico|xml)$ {
       access_log        off;
       log_not_found     off;
       expires           360d;

Save and close the file. Then test Nginx configurations.

sudo nginx -t

If the test is successful, reload Nginx for the changes to take effect.

sudo systemctl reload nginx

Now you should be able to see the Roundcube web-based install wizard at

Step 5: Enabling HTTPS

It’s highly recommended that you use TLS to encrypt your webmail. We can enable HTTPS by installing a free TLS certificate issued from Let’s Encrypt. Run the following command to install Let’s Encrypt client (certbot) on Ubuntu 18.04 server.

sudo apt install certbot

If you use Nginx, then you also need to install the Certbot Nginx plugin.

sudo apt install python3-certbot-nginx

Next, run the following command to obtain and install TLS certificate.

sudo certbot --nginx --agree-tos --redirect --hsts --staple-ocsp --email -d

If you use Apache, install the Certbot Apache plugin.

sudo apt install python3-certbot-apache

And run this command to obtain and install TLS certificate.

sudo certbot --apache --agree-tos --redirect --hsts --staple-ocsp --email -d


  • --nginx: Use the nginx plugin.
  • --apache: Use the Apache plugin.
  • --agree-tos: Agree to terms of service.
  • --redirect: Force HTTPS by 301 redirect.
  • --hsts: Add the Strict-Transport-Security header to every HTTP response. Forcing browser to always use TLS for the domain. Defends against SSL/TLS Stripping.
  • --staple-ocsp: Enables OCSP Stapling. A valid OCSP response is stapled to the certificate that the server offers during TLS.

The certificate should now be obtained and automatically installed.

roundcube webmail https letsencrypt

Note: If you followed my Postfix/Dovecot tutorial, and now you install Roundcube on the same server, then certbot will probably tell you that a certificate for already exists as shown below, so you can choose to install the existing TLS certificate to your web server configuration file.

roundcube postfix dovecot certbot https certificate

Step 6: Finish the Installation in Web Browser

In your web browser, go to the Roundcube installer page.

The web installer will first check if PHP extensions, database and 3rd party libraries are installed. If you follow this tutorial, then all requirements should be met.

roundcube ubuntu 18.04

Click Next button. In the 2nd page, you need to fill in MariaDB database details that you created earlier.

roundcube mariadb user

The IMAP and SMTP section allows you to configure how to receive and submit email. Enter the following values for IMAP.

  • IMAP host: ssl://  port: 993

Enter the following values for SMTP settings.

  • SMTP port: tls://  port: 587

roundcube smtp settings


Next, you can scroll down to the Plugins section to enable some plugins. For example: the password plugin, mark as junk plugin and so on. I enabled all of them.

roundcube enable plugins

Once that’s done, click create config button which will create configuration based on the information you entered. You need to copy the configuration and save it as under the /var/www/roundcube/config/ directory.

roundcube webmail installer

Once the file is created, click continue button. In the final step, test your SMTP and IMAP settings by sending a test email and checking IMAP login.

roundcube webmail test smtp & imap config

If the test fails, then you can click the 2. Create config link on the top of page to go back to step 2 and recreate the file.

If test is successful, go to your Webmail domain without /installer and login.

roundcube webmail elastic skin

Roundcube Webmail interface

roundcube ubuntu server apache nginx

Now you should remove the whole installer folder from the document root or make sure that enable_installer option in file is disabled.

sudo rm /var/www/roundcube/installer/ -r

These files may expose sensitive configuration data like server passwords and encryption keys to the public. Make sure you cannot access the installer page from your browser.

Step 7: Configure the Sieve Message Filter

You can create folders in Roundcube webmail and then create rules to filter email messages into different folders. In order to do this, you need to install the ManageSieve server with the following command.

sudo apt install dovecot-sieve dovecot-managesieved

By default, Postfix uses its builtin local delivery agent (LDA) to move inbound emails to the message store (inbox, sent, trash, Junk, etc). We can configure it to use Dovecot to deliver emails, via the LMTP protocol, which is a simplified version of SMTP. LMTP allows for a highly scalable and reliable mail system and it is required if you want to use the sieve plugin to filter inbound messages to different folders.

Install the Dovecot LMTP Server.

sudo apt install dovecot-lmtpd

Edit the Dovecot main configuration file.

sudo nano /etc/dovecot/dovecot.conf

Add lmtp and sieve to the supported protocols.

protocols = imap lmtp sieve

Save and close the file. Then edit the Dovecot 10-master.conf file.

sudo nano /etc/dovecot/conf.d/10-master.conf

Change the lmtp service definition to the following.

service lmtp {
 unix_listener /var/spool/postfix/private/dovecot-lmtp {
   group = postfix
   mode = 0600
   user = postfix

Next, edit the Postfix main configuration file.

sudo nano /etc/postfix/

Add the following lines at the end of the file. The first line tells Postfix to deliver emails to local message store via the dovecot LMTP server.  The second line disables SMTPUTF8 in Postfix, because Dovecot-LMTP doesn’t support this email extension.

mailbox_transport = lmtp:unix:private/dovecot-lmtp
smtputf8_enable = no

Save and close the file. Open the /etc/dovecot/conf.d/15-lda.conf file.

sudo nano /etc/dovecot/conf.d/15-lda.conf

Scroll to the end of the file, uncomment the mail_plugins line and add the sieve plugin to local delivery agent (LDA).

protocol lda {
    # Space separated list of plugins to load (default is global mail_plugins).
    mail_plugins = $mail_plugins sieve

Save and close the file. If you can find the 20-lmtp.conf file under /etc/dovecot/conf.d/ directory, then you should also enable the sieve plugin in that file like below.

protocol lmtp {
      mail_plugins = quota sieve

Edit the /etc/dovecot/conf.d/10-mail.conf file.

sudo nano /etc/dovecot/conf.d/10-mail.conf

Sieve scripts are stored under each user’s home directory. If you followed my PostfixAdmin tutorial and are using virtual mailbox domains, then you need to enable mail_home for the virtual users by adding the following line in the file, because virtual users don’t have home directories by default.

mail_home = /var/vmail/%d/%n

Save and close the file.

Finally, restart Postfix and Dovecot.

sudo systemctl restart postfix dovecot

Now you can go to Roundcube webmail, open an email message and click the more button and select create filters to create message filters. For example, I create a filter that moves every email sent from to the Red Hat folder.

roundcube sieve filter

Step 8: Adding Local DNS Entry

It’s recommended to edit the /etc/hosts file and add the following entry, so that Roundcube won’t have to query the public DNS, which will speed up web page loading a little bit.  localhost

Step 9: Removing Sensitive Information from Email Headers

By default, Roundcube will add a User-Agent email header, indicating that you are using Roundcube webmail and the version number. You can tell Postfix to ignore it so recipient can not see it. Run the following command to create a header check file.

sudo nano /etc/postfix/smtp_header_checks

Put the following lines into the file.

/^User-Agent.*Roundcube Webmail/            IGNORE

Save and close the file. Then edit the Postfix main configuration file.

sudo nano /etc/postfix/

Add the following line at the end of the file.

smtp_header_checks = regexp:/etc/postfix/smtp_header_checks

Save and close the file. Then run the following command to rebuild hash table.

sudo postmap /etc/postfix/smtp_header_checks

Reload Postfix for the change to take effect.

sudo systemctl reload postfix

Now Postfix won’t include User-Agent: Roundcube Webmail in the headers when sending outgoing emails.

Step 10: Configure the Password Plugin in Roundcube

Roundcube includes a password plugin that allows users to change their password from the webmail interface. However, we need to configure it before it will work. Edit the password plugin configuration file. Run the following command to copy the distributed password plugin config file to a new file.

sudo cp /var/www/roundcube/plugins/password/ /var/www/roundcube/plugins/password/

Edit the password plugin configuration file.

sudo nano /var/www/roundcube/plugins/password/

Find the following line:

$config['password_db_dsn'] = '';

This parameter is used to tell the password plugin where the user passwords are stored. By default, the value is empty and it will query the roundcube database, which doesn’t store user passwords. If you followed my PostfixAdmin tutorial, then user passwords are stored in the postfixadmin.mailbox table, so we need to change the value to:

$config['password_db_dsn'] = 'mysql://postfixadmin:postfixadmin_database_password@';

The tells the password plugin to connect to the postfixadmin database. If you don’t remember your postfixadmin database password, you can find it in the /etc/dovecot/dovecot-sql.conf.ext file.

Then find the following line.

$config['password_query'] = 'SELECT update_passwd(%c, %u)';

Change it to the following.

$config['password_query'] = "UPDATE mailbox SET password=%D,modified=NOW() WHERE username=%u";

I recommend enabling a password strength checker to prevent users from setting week passwords. Go to the beginning of this file, you can find the following line.

$config['password_strength_driver'] = null;

We can use the zxcvbn password strength driver, so change it to:

$config['password_strength_driver'] = 'zxcvbn';

Add the following line in this file to allow strong passwords only.

$config['password_zxcvbn_min_score'] = 5;

Note: The $config['password_minimum_score'] parameter doesn’t work with the zxcvbn driver, so leave it alone.

You can also set a minimum length for the password. Find the following line.

$config['password_minimum_length'] = 0;

Change it to:

$config['password_minimum_length'] = 8;

Recall that we used the ARGON2I password scheme in the PostfixAdmin tutorial, so we also need to configure the password plugin to use ARGON2I. Find the following lines in the file.

$config['password_algorithm'] = 'clear';

By default, the password will be stored as clear text, change the value to the following to use Dovecot’s builtin password algorithm.

$config['password_algorithm'] = 'dovecot';

Then find the following line, which tells where the Dovecot’s password hash generator is located.

$config['password_dovecotpw'] = '/usr/local/sbin/dovecotpw'; // for dovecot-1.x

Change it to the following.

$config['password_dovecotpw'] = '/usr/bin/doveadm pw -r 5';

Then find the following line, which tells which password scheme will be used.

$config['password_dovecotpw_method'] = 'CRAM-MD5';

Change it to:

$config['password_dovecotpw_method'] = 'ARGON2I';

Find the following line.

$config['password_dovecotpw_with_method'] = false;

Change false to true. This will add a {ARGON2I} prefix to the hashed password, so you will recognize which password scheme is used.

$config['password_dovecotpw_with_method'] = true;

Save and close the file. Since this file contains the database password, we should allow only the www-data user to read and write to this file.

sudo chown www-data:www-data /var/www/roundcube/plugins/password/
sudo chmod 600 /var/www/roundcube/plugins/password/

Now users should be able to change their passwords in the Roundcube webmail interface.

roundcube webmail change password

How to Set Up Vacation/Out-of-Office Messages

We can use the sieve filter to create vacation/out-of-office messages. Go to Roundcube Settings -> Filters. Then click the create button to create a filter.

  • Give this filer a name like “out of office”.
  • New filters are not disabled, so you can leave the button alone.
  • In the Scope field, select all messages.
  • Select Replay with message in the Actions settings, and enter the message that will be automatically sent.
  • Enter 1 in how ofter send messages. Leave other text field empty.
  • Click the Save button and you are done.

roundcube vacation out of office message

When you are back to office, you can toggle the “Filter disabled” button, and click the Save button to disable this filter.

Increase Upload File Size Limit

If you use PHP-FPM to run PHP scripts, then files such as images, PDF files uploaded to Roundcube can not be larger than 2MB. To increase the upload size limit, edit the PHP configuration file.

sudo nano /etc/php/7.2/fpm/php.ini

Find the following line (line 846).

upload_max_filesize = 2M

Change the value like below. Note that this value should not be larger than the attachment size limit set by Postfix SMTP server.

upload_max_filesize = 50M

Then find the following line (line 694).

post_max_size = 8M

Change the maximum size of POST data that PHP will accept.

post_max_size = 50M

Save and close the file. Alternatively, you can run the following two commands to change the value without manually opening the file.

sudo sed -i 's/upload_max_filesize = 2M/upload_max_filesize = 50M/g' /etc/php/7.4/fpm/php.ini

sudo sed -i 's/post_max_size = 8M/post_max_size = 50M/g' /etc/php/7.4/fpm/php.ini

Then restart PHP-FPM.

sudo systemctl restart php7.2-fpm

Nginx also sets a limit of upload file size. The default maximum upload file size limit set by Nginx is 1MB. If you use Nginx, edit the Nginx configuration file.

sudo nano /etc/nginx/conf.d/

Add the following line in the SSL virtual host.

client_max_body_size 50M;

Save and close the file. Then reload Nginx for the changes to take effect.

sudo systemctl reload nginx

There are 3 plugins in Roundcube for attachments/file upload:

  • database_attachments
  • filesystem_attachments
  • redundant_attachments

Roundcube can use only one plugin for attachments/file uploads. I found that the database_attachment plugin can be error_prone and cause you trouble. To disable it, edit the Roundcube config file.

sudo nano /var/www/roundcube/config/

Scroll down to the end of this file. You will see a list of active plugins. Remove 'database_attachments' from the list. Save and close the file.

Troubleshooting Tips

If you encounter errors, you can check the web server error logs at /var/log/apache2/roundcube_error.log (if you are using Apache), or /var/log/nginx/roundcube.error (if you are using Nginx.), also the Roundcube error logs in /var/www/roundcube/logs/ directory.

Wrapping Up

I hope this tutorial helped you install Roundcube Webmail on Ubuntu 18.04. As always, if you found this post useful,  subscribe to our free newsletter to get more tips and tricks 🙂

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37 Responses to “Install Roundcube Webmail on Ubuntu 18.04 with Apache/Nginx

  • Hi!

    I successfully login with roundcube but unable to login with config filed credentials.

    Can you help me out?


  • After roundcube installer(configuration) setting with login details it shows error like

    IMAP connect: NOT OK(Login failed for roundcubeuser against from AUTHENTICATE PLAIN: Authentication failed.)

  • i don’t have email account with register domain name.
    so try my personal gmail account that says login failed,

    and also try root login with domain as suffix says connection to IMAP server failed.

    How i solved this puzzle?

  • Is this necessary to create email account for domain name?
    Is there any another option to login in roundcube?

  • I had to add the below:

    smtpd_sasl_auth_enable = yes

    in /etc/postfix/ ?

    • I usually add it in the submission service in /etc/postfix/

      submission     inet     n    -    y    -    -    smtpd
       -o syslog_name=postfix/submission
       -o smtpd_tls_security_level=encrypt
       -o smtpd_tls_wrappermode=no
       -o smtpd_sasl_auth_enable=yes
       -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
       -o smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject
       -o smtpd_sasl_type=dovecot
       -o smtpd_sasl_path=private/auth

      This will enable SASL authentication on port 587.

      If you add it in the /etc/postfix/ file, then SASL authentication will also be enabled on port 25, which I don’t recommend.

  • Ken D'Ambrosio
    10 months ago

    Hi! I’ve had RoundCube running for a few years, now, and love it. And even better, some of the newer skins have great mobile support. But one thing has bugged me: having to keep logging in on devices that are mine. I found one old plugin that I never was able to get to work… and then I found this: — actively being updated (I don’t even know what-all he’s adding), and works like a charm. Made me remove a fat client from my (Android) phone and tablet altogether. (For notifications — which RoundCube doesn’t, to the best of my knowledge, supply — I use Poppy, an app which polls the mailboxes and notifies on new mail.)

  • moulnengsonarat
    10 months ago

    i already install successfully all are work but how can i add new user for example password123 password123 for aroundcube i have no idea i am newbie for linux just follow your tutorial is working fine but i want to create 3 or 4 user for that mail server please kindly help

    • If you followed my email server from scratch tutorial series, then you can use PostfixAdmin to manage users.

      • moulnengsonarat
        10 months ago

        thank you so much for replay in my server i use ubuntu 18.04 i installed LAMP , postfix dovecote and roundcube and follow the instruction all are good but when i log in it said ” connection to server storage failed ” here is the video i follow and kind of mix together. but i replace the squirrelmail with roundcube

        please kindly help

    • In the YouTube video, the mail_location is changed to /var/spool/mail. I think you need to use the default location as below.

      mail_location = mbox:~/mail:INBOX=/var/mail/%u

      PS: I don’t recommend mixing mail server tutorials from different places. You can follow my comprehensive mail server tutorial series here:

  • Hi,
    I tried to config the Sieve Message Filter with your but the server doesn’t have the port 4190 open and I cannot connect from roundcube.

    Can you help me?


    • Edit the Dovecot main configuration file.

      sudo nano /etc/dovecot/dovecot.conf

      Add the sieve protocol.

      protocols = imap lmtp sieve

      Save and close the file. Then restart Dovecot.

      sudo systemctl restart dovecot
      • Willy Tjahjono
        7 months ago

        Hi, I have followed your instructions but am still getting that unable to connect managesieve server. Which config file should I modify? Thank you.

  • Ok, well I can now authenticate on the Thunderbird client without any issue. Sending mail and receiving mail : O.K. And it is awesome!

    But I wanted to implement a webmail interface. So I followed your tutorial step by step for the installation of Roundcube. The authentication to the smtp server works ->

    But when I try the with the imap server, I get an error.

    Feb 11 11:43:24 dovecot[14101]: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=, rip=, lip=, TLS handshaking: SSL_accept() failed: error:14094418:SSL rout
    • You can try editing the dovecot SSL configuration file.

      sudo nano /etc/dovecot/conf.d/10-ssl.conf

      Set ssl_prefer_server_ciphers to yes.

      ssl_prefer_server_ciphers = yes

      Restart Dovecot.

      sudo systemctl restart dovecot
  • I found interesting settings for roundcube imaps connection. Actually your setting with these made things work.

    Here is what I added to :

    $config['imap_conn_options'] = array(
        'ssl' => array(
            'verify_peer'      => false,
            'verify_peer_name' => false,

    Now everything works as it should. I thank you a lot for the time spend to help me. Keep up with your work ! Have a nice day !! 🙂

  • I made a mistake on creating the CMariaDB Database and User for Roundcube.

    How can I remove a create a new one?

    • – I made a mistake with this step “Create a MariaDB Database and User for Roundcube”.
      – Is there any way to delete the database so I can start over?

    • You can log into MariaDB shell and list existing databases.

      show databases;

      To delete a database, run the following command. Replace database-name with the real database name.

      drop database database-name

      Then, you can create the database again.

    • Thank You.

      Do I need to fill the “username_domain” in IMAP settings ?

  • hi, in roundcube config
    can’t connect to imap server
    i followed your basic tutorial mail setup

    Connecting to ssl://…
    IMAP connect: NOT OK(Login failed for against from Could not connect to ssl:// Unknown reason)

    2 months ago

    First, where is the line I can put this command Xiao?

    client_max_body_size 50M;
    • Inside the SSL server block, like this:

      server {
        root /var/www/roundcube/;
        index index.php index.html index.htm;
        client_max_body_size 50M;
          listen 443 ssl ; # managed by Certbot
          ssl_certificate /etc/letsencrypt/live/; # managed by Certbot
          ssl_certificate_key /etc/letsencrypt/live/; # managed by Certbot
          include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
          ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
          add_header Strict-Transport-Security "max-age=31536000" always; # managed by Certbot
          ssl_trusted_certificate /etc/letsencrypt/live/; # managed by Certbot
          ssl_stapling on; # managed by Certbot
          ssl_stapling_verify on; # managed by Certbot
    1 month ago

    Hi Xiao Guoan, I check the web server error log

    root@mail:~# tail -f /var/log/nginx/roundcube.error

    I got the error like this:

    2020/09/12 10:41:52 [crit] 23041#23041: *198 SSL_do_handshake() failed (SSL: error:1420918C:SSL routines:tls_early_post_process_client_hello:version too low) while SSL handshaking, client:, server:
    2020/09/13 08:31:54 [crit] 29815#29815: *530 SSL_do_handshake() failed (SSL: error:1420918C:SSL routines:tls_early_post_process_client_hello:version too low) while SSL handshaking, client:, server:

    Please help, thank you Xiao Guoan

    • It simply means the client was trying to use SSL parameters that aren’t supported by your Nginx server. This is nothing to worry about. The default SSL configuration added by Let’s Encrypt (certbot) is compatible with modern web browsers. It could be that some guy was trying to test your Nginx SSL configurations, or a user was using a really old web browser to access the webmail.

  • Hey. Hope you are doing well.
    I followed all the steps of Step 1 and step 2 of your tutorial and installed Postfix and Dovecot, and I did all you said.
    But when I click login or send email in roundcube, nothing happens but a 504 gateway time-out.
    I sent emails successfully via SSH to my yahoo and gmail account, but not able to login in roundcube test!
    Why is it happening? I even entered ports as you told, but no idea why I don’t see nothing?
    I leave an attachment. Is that ok?
    Thank you

    • Maybe you need to restart PHP-FPM.

      sudo systemctl restart php7.2-fpm
    • By the way, you should not enable the Cloudflare proxy (CDN) feature for the A record of your mail server.

      Cloudflare doesn’t support SMTP proxy. You will not be able to receive emails when Cloudflare CDN is turned on for your mail server.

  • Hi Xiao,

    I have created the subdomain but it constantly redirects to the root domain, cleared cache of the browser, and syntax on Nginx is ok and successful.

    I have been trying hours for a solution.

    What could be the issue?


  • Hi, do I need to have separate Roundcube installations for different domains I have? I have already configured them through postfix and postfixadmin, they are working like a charm using an email client. I’m only asking this for the web-client Roundcube.

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