On Fri, May 09, 2014 at 11:35:04PM -0500, deoren wrote:
> If a spam email makes it "in" through the backup MX and is delivered to the
> primary, will the 'permit_mynetworks' or 'check_client_access' directives
> prevent other checks from blocking the email? In other words, do those two
> directives only apply to mail that originates from the backup MX itself or
> all mail that flows through it?
All mail that flows through it. However, you need to whitelist your backup
MX from spam checks anyway. Otherwise it becomes a backscatter source.
If your backup MX spam filtering is not good enough, either improve
that get a different backup MX, or don't have a backup MX.
--
Viktor.
