1.8 KiB
Amavisd: process more emails concurrently
Amavisd-new is content filter, it will invoke SpamAssassin and ClamAV for spam/virus scanning, it also offers additional features like DKIM signing and verification.
In Amavisd config file, $max_servers sets
the number of concurrent Amavisd processes and it must match the number set
in /etc/postfix/master.cf maxproc column for the smtp-amavis service.
Sample settings:
# File: /etc/amavisd/amavisd.conf
$max_servers = 4;
# File: /etc/postfix/master.cf
smtp-amavis unix - - - - 4 smtp
...
Both values should be identical for two reasons: If Amavisd offers more processes than Postfix will ever use, Amavisd wastes resources. On the other hand, if Postfix starts more dedicated transports than amavisd can handle simultaneously, e-mail transport will be refused and logged as error.
If many emails stalled in mail queue (check with command postqueue -p), and
your server has powerful CPU and memory, you can increase the number of
concurrent Amavisd processes, so that it can process more emails at the same
time. Sample setting:
# File: /etc/amavisd/amavisd.conf
$max_servers = 10;
Restarting Amavisd service is required.
# File: /etc/postfix/master.cf
smtp-amavis unix - - - - 10 smtp
...
Note: If you don't want to modify /etc/postfix/master.cf, it's ok to set
smtp-amavis_destination_concurrency_limit = 10 in /etc/postfix/main.cf
instead.
Restarting Postfix service is required if you modified /etc/postfix/master.cf,
reloading OR restarting is required if you modified /etc/postfix/main.cf.
References: