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

Connect to the server via SSH

Note: if direct SSH access to the server is not possible, contact the server administrator for further assistance.

Change the PHP settings as follows in /etc/psa-webmail/roundcube/php.ini: 

upload_max_filesize = 256M
post_max_size = 256M 

Note: Set higher values if it is required.

Modify templates and apply the change to all domains, perform the next steps. Create the custom templates directory for webmail:

# mkdir -p /usr/local/psa/admin/conf/templates/custom/webmail

Then copy the template to the custom templates folder:

# cp /usr/local/psa/admin/conf/templates/default/webmail/roundcube.php /usr/local/psa/admin/conf/templates/custom/webmail/

Edit the FcgidMaxRequestLen directive in the custom template:

# sed -i ‘/FcgidMaxRequestLen/cFcgidMaxRequestLen 268435456’ /usr/local/psa/admin/conf/templates/custom/webmail/roundcube.php

Apply changes within the template to all webmails using the next command:

# plesk repair web -server

Connect to the server via SSH

Note: if direct SSH access to the server is not possible, contact server administrator for further assistance.

Change the PHP settings as follows in /etc/psa-webmail/horde/horde/php.ini: 

upload_max_filesize = 256M
post_max_size = 256M 

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.

Modify templates and apply the change to all domains, perform the next steps. Create the custom templates directory for webmail:

# mkdir -p /usr/local/psa/admin/conf/templates/custom/webmail

Then copy the template to the custom templates folder:

# cp /usr/local/psa/admin/conf/templates/default/webmail/horde.php /usr/local/psa/admin/conf/templates/custom/webmail/

Edit the FcgidMaxRequestLen directive in the custom template:

# sed -i ‘/FcgidMaxRequestLen/cFcgidMaxRequestLen 268435456’ /usr/local/psa/admin/conf/templates/custom/webmail/horde.php

Apply changes within the template to all webmails using the next command:

# plesk repair web -server

Connect to the server via SSH