Unable to send an email in Roundcube webmail hosted in Plesk: Allowed memory size of X bytes exhausted

Symptoms

• When sending/opening an email with attachment in Roundcube, nothing happens.

• the following error message is logged in /var/log/plesk-roundcube/errors:

  PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 16128 bytes) in /usr/share/psa-roundcube/...

Cause

Roundcube PHP memory limit exceeded.

Resolution

Warning: the changes will be reverted during the next Roundcube package update. The value of memory_limit directive is reset to default of 64M.

1. Connect to the Plesk server via SSH.

2. Open the file /etc/psa-webmail/roundcube/php.ini in a text editor. In this example, we are using the vi editor:

   # vi /etc/psa-webmail/roundcube/php.ini

3. Increase the memory limit value:

   memory_limit = 256M

4. Save the changes and close the file.