Il 2017-09-28 18:41 Noel ha scritto:
[..]
First, [...] If the two hosts
aren't physically close -- on the same switch -- this just isn't
practical.
Eh, my two VPS are in two different geographic locations.
This spoils everything
Secondly, [..]And if the
postscreen cache is on the primary and unreachable, then you won't
be getting any mail.
OK
The best way to reduce spam on the backup MX server is to not use a
backup MX server.
:-)
If you feel you must have a backup MX, then the backup must have
spam controls equal to or more strict than the primary, and backup
must have a current recipient list so it can reject unknown
recipients. The primary must never reject mail forwarded from the
backup.
Well, this is clear!
And and at this point, excluding for the reasons above, Postcreen, if I
enabled DKIM keys on both servers? This solution could be stop spam
email from non-existent aliases that come from my domains?
For example a my domain could be foo.com and I have postfix virtual
user: o...@foo.com and t...@foo.com and receive email spam from
nonexistent th...@foo.com.
The DKIM solution on both servers could stop spam from th...@foo.com? Or
maybe should I configure better local_recipient_maps?
many thanks again and thanks for your patience!! :-)
Davide
