How to change the maximum attachment size for webmail on Plesk server?

Note: Use any text editor like vi or nano to modify such values

1. Connect to the server via SSH.

2. Change the PHP settings below: 

   CONFIG_TEXT: upload_max_filesize = 64M
   post_max_size = 128M 

   • For Horde edit /etc/psa-webmail/horde/horde/php.ini file

   • For Roundcube edit  /etc/psa-webmail/roundcube/php.ini file

3. Modify also horde attach_size_limit value at /etc/psa-webmail/horde/imp/conf.php, it should be set to 0 (unlimited):

   # grep attach_size_limit /etc/psa-webmail/horde/imp/conf.php
   $conf['compose']['attach_size_limit'] = 0;

   Note: Set higher values if it is required.

Note: Use any text editor like notepad to modify such values

For Horder webmail

1. Connect to the server via RDP.

2. Change the PHP settings for Horde on the file %plesk_dir%webmail\horde\conf\php.ini, as example:

   C:\> type %plesk_dir%webmail\horde\conf\php.ini | findstr max
   ...
   upload_max_filesize = 64M
   post_max_size = 128M
   ...

3. Modify also horde attach_size_limit value at %plesk_dir%Webmail\horde\horde\imp\config\conf.php, it should be set to 0 (unlimited):

   C:\> type %plesk_dir%Webmail\horde\horde\imp\config\conf.php | findstr attach_size_limit
   $conf['compose']['attach_size_limit'] = 0;

   Note: Set higher values if it is required.

For MailEnable webmail

1. Connect to the server via RDP.
2. Go to Windows > Mailenable > Servers > localhost > right-click on SMTP > properties;
3. Under Limit outbound size, specify a higher value in Maximum field;
   
4. Click OK;
5. Stop and start the SMTP service to apply the new change at Windows > Mailenable > Servers > localhost > right-click on SMTP.

   Note: If the issue persists, apply the solution described in MailEnable KB

   Note: Set higher values if it is required.