Mail Service
To provide a mail service, Plesk supports two mail transfer agents: Postfix and qmail.
Plesk uses only one mail transfer agent at a time. You can check which of them is currently enabled on the following page: Server Administration Panel > Tools & Settings > Services Management. You can also do this by running the mailmng
utility located in the $PRODUCT_ROOT_D/admin/sbin/
directory, where
the $PRODUCT_ROOT_D
is /usr/local/psa
for RPM-based systems or /opt/psa
on DEB-based systems:
By default, Plesk for Linux uses the Postfix for sending and receiving mail through the SMTP and SMTPS protocols. You can switch to qmail by running the following command:
To switch to Postfix run the following command:
Both Postfix and qmail use the same root directory to store incoming mail. This directory is defined by the variable $PLESK_MAILNAMES_D
in the /etc/psa/psa.conf
configuration file. By default, it is /var/qmail/mailnames
. Storing incoming mail in the same directory allows the messages remain available after switching between mail agents.
Unlike incoming mail, the mail queue is lost while switching between the mail agents. Therefore, before switching, we recommend you stop the SMTP service to prevent the acceptance of email and the delivery of all queued mail. To stop the SMTP service, run the following command:
To flush the queue, run the command:
for qmail: # kill -ALRM `pidof qmail-send`
for Postfix: # postqueue -f