How to change maximum attachment size in webmail shipped with Plesk Premium Email?

Answer

Note: The solution can be applied only by the administrator of the Plesk server. If you do not have administrative access to the server, please contact the hosting provider or administrator of the server.

1. Connect to the server using SSH.

2. Open the file /etc/roundcubemail/php.ini for editing.

3. Increase the value of parameters upload_max_filesize and post_max_size and save the changes:

   Note: The below values are just an example.

   upload_max_filesize = 64M
   post_max_size = 64M

4. If a value of more than 75M is set in the previous step, then also add the parameter $config['max_message_size'] to the file /etc/roundcubemail/config.inc.php:

   • Open the file /etc/roundcubemail/config.inc.php for editing.

   • Add the following line to it and save the changes:

     $config['max_message_size'] = '133M';

     Note: The above value is shown as an example. The real value must be 133% of the value set in step 3 - for example, if 100M was set there, then 133M must be set here.

5. Reload Apache to apply the changes:

   • On CentOS/RHEL/CloudLinux/AlmaLinux:

     # service httpd reload

   • On Debian and Ubuntu:

     # service apache2 reload