Install Roundcube Webmail on CentOS 8/RHEL 8 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 CentOS 8/RHEL 8 with Apache or Nginx web server.

Roundcube 1.4.2 Release

Roundcube 1.4.2 was released on January 2, 2020. 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. Now let’s proceed to install Roundcube.

Step 1: Download Roundcube Webmail on CentOS 8/RHEL 8

Log in to your CentOS/RHEL server via SSH, then run the following command to download the latest 1.4.2 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 1.4.2 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-1.4.2-complete.tar.gz

sudo mkdir /var/www/

sudo mv roundcubemail-1.4.2 /var/www/roundcube

Step 2: Install Dependencies

Roundcube requires the php-imap module to create subfolders in mailboxes, but php-imap isn’t included in the default CentOS 8/RHEL 8 repository, so we need to use the Remi repo to install this PHP module.

Install the Remi Repo.

sudo dnf install -y

Then reset PHP module streams.

sudo dnf module reset php

Enable the php:remi-7.4 module stream.

sudo dnf module enable php:remi-7.4 -y

Then you can run the following command to install PHP modules required or recommended by Roundcube.

sudo dnf install php-ldap php-imagick php-common php-gd php-imap php-json php-curl php-zip php-xml php-mbstring php-bz2 php-intl php-gmp

Step 3: Create a MariaDB Database and User for Roundcube

Log into MariaDB shell as root.

mysql -u root -p

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:


Run the following command to import the initial tables to roundcube database. You need to enter the MariaDB root password.

mysql -u root -p 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/httpd/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/httpd/conf.d/

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 /var/log/httpd/roundcube_error.log
  CustomLog /var/log/httpd/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. Reload Apache for the changes to take effect.

sudo systemctl reload httpd

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, an 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;
  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-fpm/www.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.

If you use Apache, run this command to obtain and install TLS certificate.

sudo /usr/local/bin/certbot --apache --agree-tos --redirect --hsts --staple-ocsp --email [email protected] -d

If you use Nginx, run the following command to obtain and install TLS certificate.

sudo /usr/local/bin/certbot --nginx --agree-tos --redirect --hsts --staple-ocsp --email [email protected] -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 centos

Step 6: Setting Up Permissions

First, we need to change the SELinux context of the web directory, so it can be used to serve web content.

sudo chcon -t httpd_sys_content_t /var/www/roundcube/ -R

The web server needs to write to the temp and logs directory. Change the SELinux context to make it writable.

sudo chcon -t httpd_sys_rw_content_t /var/www/roundcube/temp/ /var/www/roundcube/logs/ -R

Then grant write permission to the web server.


sudo setfacl -R -m u:apache:rwx /var/www/roundcube/temp/ /var/www/roundcube/logs/


sudo setfacl -R -m u:nginx:rwx /var/www/roundcube/temp/ /var/www/roundcube/logs/

By default, SELinux forbids Apache/Nginx to make network requests to other servers, but later Apache/Nginx needs to request TLS certificate status from Let’s Encrypt CA server for OCSP stapling, so we need to tell SELinux to allow Apache/Nginx with the following command.

sudo setsebool -P httpd_can_network_connect 1

If you use Nginx, then you also need to run the following command to give the nginx user read and write permissions to 3 directories.

sudo setfacl -R -m u:nginx:rwx /var/lib/php/opcache/ /var/lib/php/session/ /var/lib/php/wsdlcache/

Restart Apache/Nginx.

sudo systemctl restart httpd

sudo systemctl restart nginx

Step 7: 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-centos 8

Click Next button. In the 2nd page, you need to fill in MariaDB database details that you created in step 3.

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

roundcube imap settings

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.

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 dovecot-pigeonhole package with the following command.

sudo dnf install dovecot-pigeonhole

If you followed my PostfixAdmin tutorial and are using virtual mailbox domains, then you need to edit the sieve configuration file.

sudo /etc/dovecot/conf.d/90-sieve.conf

Find the following line:

sieve = file:~/sieve;active=~/.dovecot.sieve

Change it to:

sieve = file:/var/vmail/%d/%n/sieve;active=/var/vmail/%d/%n/.dovecot.sieve

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.

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. 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

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

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.

Wrapping Up

I hope this tutorial helped you install Roundcube Webmail on CentOS 8/RHEL 8. As always, if you found this post useful,  subscribe to our free newsletter to get more tips and tricks 🙂

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6 Responses to “Install Roundcube Webmail on CentOS 8/RHEL 8 with Apache/Nginx

  • Frank Aguirre
    2 months ago

    Gracias por compartir

  • Hi,
    I follow all steps from Step 1 to this but on Roundcube I get error on test SMTP

    Trying to send email…
    SMTP send: NOT OK(Connection failed: Failed to connect socket: Connection refused)

    And on IMAP error
    Connecting to ssl://…
    IMAP connect: NOT OK(Login failed for [email protected] against mail.mydomain from 27.255.XX.XXX. Could not connect to ssl:// Unknown reason)

    Please tell what I am doing wrong?

    I can send email using mail function.


  • Thank you for the detailed guide, I will follow it and respond back if all goes well!

  • Stéphan
    1 hour ago


    don’t you have to set owner of /var/www/roundcube to the correct user depending if you’re using roundcube or nginx user ?


    • The web server needs to have write permission on /var/www/roundcube/temp/ and /var/www/roundcube/logs/ directory, and have read permission on the main /var/www/roundcube/ directory.

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