[CentOS] postfix - reject of incoming mail due to helo check??

Fri Feb 3 16:06:59 UTC 2012
Les Mikesell <lesmikesell at gmail.com>

On Fri, Feb 3, 2012 at 8:14 AM, Reindl Harald <h.reindl at thelounge.net> wrote:
> on both sides of the NAt you need a DNS with the correct mapping
> the host on the other side is not interested in your NAT
> it sees a IP, a HELO and DNS-Records
> so it is YOUR job as admin to provide the correct HELO for your
> outgoing IP and even configure the DNS behind the NAT correctly
> if you like it really clean

Your HELO has nothing to do with your source IP, and you can't
possibly expect a multi-homed server to adjust its HELO to the
interface it happens across.   Expecting the reverse DNS of the source
IP to give a name that has the same IP in an A record lookup is
somewhat different, but still I don't think that is an actual
requirement.   As a mail admin, you are of course free to discard your
users' mail for any whimsical reason you like, but if you want to say
it is a requirement, please quote the MUST in an RFC.

   Les Mikesell
    lesmikesell at gmail.com