Symptoms
- When mailbox on Plesk server is full, email sent to the mailbox is rejected during SMTP session without bounce message.
- In
/var/log/maillog, the following entries can be found:qmail-queue-handlers[15273]: Handlers Filter before-queue for qmail started ...
qmail-queue-handlers[15273]: from=mail1@example.com
qmail-queue-handlers[15273]: to=mail1@example.com
qmail-queue-handlers[15273]: handlers_stderr: DATA Mailbox full#015
qmail-queue-handlers[15273]: handlers_stderr: DEFER
qmail-queue-handlers[15273]: DEFER during call 'check-quota' handler
Cause
By default, Plesk's mail service does not send bounce response when a user's mailbox is full to prevent mass spamming with bounce messages. Plesk "check-quota" mail handler is used for deferring incoming emails without bounce message.
Resolution
The feature described above can be disabled on Plesk server.
Solution for Plesk Onyx and higher
Note: Disabling "check-quota" mail handler is strongly not recommended because server's IP may be blacklisted due to lot of bounce messages which can be considered as spam by other servers.
Note: if user runs "plesk repair mail" command line tool it will re-enable "check-quota" mail handler back.
- Connect to the server via SSH.
-
Run the following commands to disable "check-quota" handler:
/usr/local/psa/admin/sbin/mail_handlers_control --disable --name=check-quota --type=global --queue=before-queue
/usr/local/psa/admin/sbin/mail_handlers_control --disable --name=check-quota --type=global --queue=before-sendmail
After disabling 'check-quota' handler bounce messages will be send each time when recipient's mailbox has no sufficient space to receive an email.
Solution for Plesk 12.0
Note: Disabling "check-quota" mail handler is strongly not recommended because server's IP may be blacklisted due to lot of bounce messages which can be considered as spam by other servers.
-
Backup Plesk database:
plesk db dump psa > /root/psa_dump.`date +%F.%s`.sql
-
Run the following commands to disable "check-quota" handler:
# MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysql -u admin psa -e "REPLACE INTO misc VALUES ('reject_mail_when_overquota', 'false')"
For 64-bit OS run the command:
# /usr/lib64/plesk-9.0/mail_mailbox_restore --handlers-only
For 32-bit OS run the command:
# /usr/lib/plesk-9.0/mail_mailbox_restore --handlers-only
To enable "check-quota" handler back, use following commands:
# MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysql -u admin psa -e "REPLACE INTO misc VALUES ('reject_mail_when_overquota', 'true')"
For 64-bit OS run the command:
# /usr/lib64/plesk-9.0/mail_mailbox_restore --handlers-only
For 32-bit OS run the command:
# /usr/lib/plesk-9.0/mail_mailbox_restore --handlers-only