After restarting @Mail via the sysv init, or init.d, you may have some errors with the clamdsocket not being able to connect. It looks like this:
malware acl condition: clamd: unable to connect to UNIX socket /usr/local/atmail/av/clamdsocket (Connection refused)
This may be caused by a stale clamd socket not being deleted. To fix, you can go through the following steps:
For high-traffic installations of @Mail (installation that get more than 5 messages a second; 300 a minute), the SMTP processes can be slow. You may decide to use an external Spam-filtering/Antivirus machine; if so, we recommend that you implement Exim via the following steps:Streamline Exim:
- open up your /usr/local/atmail/mailserver/configure file;
- add the following line at the top:
queue_only
- save changes, then find the following line:
timeout_frozen_after = 7d
- change this to:
timeout_frozen_after = 2d
- save changes, then go to the WebAdmin.
- in WebAdmin > Services > SMTP Settings, set "Max Queue Processes" to "1"
- afterwards, set "Remote Parallel Processes" to "1"
- turn off AV in Filters > Antivirus Settings
- turn off SpamAssassin in Filters > Anti-Spam Settings
- kill all Exim processes, and start it via the following command:
% killall -9 exim % /usr/local/atmail/mailserver/bin/exim -bd -q15m
Put the Exim db directory in a Ramdisk:
- execute the following in the terminal:
% mount -t tmpfs /dev/shm /usr/local/atmail/mailserver/spool/db/
- verify the permissions:
% chown -R atmail /usr/local/atmail/mailserver/spool/db
This will then create a mount on the db directory via the Virtual Memory mount; ultimately making access times faster.
Miscellany:
- it is generally best to have Exim and MySQL reside on the same server;
- you can further improve the performance by a cronjob-run Exim -q implementation:
--snip--
#!/usr/bin/perl
my $smtp = `ps auxww | grep "exim -q"`;
if(!$smtp) {
print "SMTP queue running...n";
system("/usr/local/atmail/mailserver/bin/exim -q");
}
--snip--
- benchmarks have been run for this implementation on a 64-bit 1.8 Ghz Core 2 machine, 2 GB of RAM, 7200 RPM IDE HD. Peaks have reached 4,000 messages and 20,000 connections a minute. Performance averaged at 50 messages a second.