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< title > Process more emails concurrently< / title >
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< / div > < h1 id = "process-more-emails-concurrently" > Process more emails concurrently< / h1 >
< p > < strong > WARNING< / strong > : Processing more concurrent emails require more RAM.< / p >
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< p > Amavisd-new is content filter, it invokes SpamAssassin and ClamAV for
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spam/virus scanning, it also offers additional features like DKIM signing and
verification.< / p >
< p > In < a href = "./file.location.html#amavisd" > Amavisd config file< / a > , < code > $max_servers< / code > sets
the number of concurrent Amavisd processes and it must match the number set
in < code > /etc/postfix/master.cf< / code > < code > maxproc< / code > column for the < code > smtp-amavis< / code > service.
Sample settings:< / p >
< pre > < code > # File: /etc/amavisd/amavisd.conf
$max_servers = 4;
< / code > < / pre >
< pre > < code > # File: /etc/postfix/master.cf
smtp-amavis unix - - - - 4 smtp
...
< / code > < / pre >
< p > 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.< / p >
< p > If many emails stalled in mail queue (check with command < code > postqueue -p< / code > ), 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:< / p >
< pre > < code > # File: /etc/amavisd/amavisd.conf
$max_servers = 10;
< / code > < / pre >
< p > Restarting Amavisd service is required.< / p >
< pre > < code > # File: /etc/postfix/master.cf
smtp-amavis unix - - - - 10 smtp
...
< / code > < / pre >
< p > Note: If you don't want to modify < code > /etc/postfix/master.cf< / code > , it's ok to set
< code > smtp-amavis_destination_concurrency_limit = 10< / code > in < code > /etc/postfix/main.cf< / code >
instead.< / p >
< p > Restarting Postfix service is required if you modified < code > /etc/postfix/master.cf< / code > ,
reloading OR restarting is required if you modified < code > /etc/postfix/main.cf< / code > .< / p >
< p > References:< / p >
< ul >
< li > < a href = "http://www.amavis.org" > Amavisd web site< / a > < / li >
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< li > < a href = "http://www.ijs.si/software/amavisd/README.postfix.html#d0e1231" > Tuning: Maximum Number of Concurrent Processes< / a > < / li >
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< li > < a href = "http://www.ijs.si/software/amavisd/README.postfix.html" > Integrating amavisd-new in Postfix< / a > < / li >
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