Gary V wrote:
> If you use Postfix you can also do this by using a second IP address
> and changing the MX record so mail goes there instead of the existing
> address. Then only enable content_filter for that address:
> http://www200.pair.com/mecham/spam/bypassing.html#3
Very interesting link!
I would suggest to always add a process limit to smtpd listener(s) so that the
server doesn't get flooded. In case of extra incoming traffic remote MTAs will
queue and retry.
If the MX IP address is on a load balancer with port forwarding capabilities
instead of a real machine, it is also possible to let postfix smtpd listen on
different ports:
smtp inet n - n - 80 smtpd
...
0.0.0.0:2025 inet n - n - 20 smtpd
...
0.0.0.0:2125 inet n - n - 40 smtpd
...
And then have (MX IP, MX port > MTA IP, MTA port):
192.168.0.1, 25 > 10.0.0.1, 25
192.168.0.1, 25 > 10.0.0.1, 2025
192.168.0.1, 25 > 10.0.0.1, 2125
Paolo
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