Hi All
We are running Postfix + amavisd-new-2.3.3-3 in our linux mail gateway.
We have been hit hard lately with SPAM and our mail queue has been
growing significantly to 10,000+ mails and it takes a few hours for the
queue to go down. We received 1.6million spam messages last month and I
believe this number is growing at around 5-10% monthly.
We were hit with 65k spam messages between the 6 hours between 00:00am
06:00am this morning, by the time business starts, the mail queue was
already soaring up to around 19k around 9am. I was watching the mail
queue growth, the throughput of incoming mail -> postfix -> amavis
(spamassassin only) -> postfix -> relay to internal hosts, was only 1-2
messages per second.
Our configuration in postfix and amavisd are as follow, the server has
1.5G memory with SCSI disks (Raid 5) and 2 x 2.x Xeon processor - we
feel the server has a decent profile and *should* cope with the
requirement.
We fiddled with the max proc for smtp-amavis below from 25, 50, 100 (and
also change max_servers variable in amavisd.conf accordingly) but the
rate/second throughput hardly changed during these periods.
Would anyone be able to share some lights on our issue? please let us
know if you require more information from our settings.
Thanks
CP
master.cf
---------
smtp inet n - - - 100 smtpd
smtp-amavis unix - - y - 25 lmtp
-o smtp_data_done_timeout=1200
-o disable_dns_lookups=yes
127.0.0.1:10025 inet n - y - 200 smtpd
-o content_filter=
-o local_recipient_maps=
-o relay_recipient_maps=
-o smtpd_restriction_classes=
-o smtpd_client_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o mynetworks=127.0.0.0/8
-o strict_rfc821_envelopes=yes
recipient_access table
----------------------
.mydomain.com FILTER smtp-amavis:[127.0.0.1]:10024
amavisd.conf
------------
$max_servers = 25; # number of pre-forked children
$max_requests = 20; # retire a child after that many accepts
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