From: Marc Owen (no email)
Date: Fri Nov 01 2002 - 08:22:02 EST
Hello,
First of all, this is not really a postfix-specific question, sorry.
I notice some hosts connect to the hosts which carry A-records for the
domain to relay mail, ignoring mx records.
For instance:
example.com. IN A 1.2.3.4
example.com. IN A 1.2.3.5
www.example.com. IN A 1.2.3.4
www.example.com. IN A 1.2.3.5
example.com. IN MX 100 mx2.example.com.
example.com. IN MX 100 mx1.example.com.
Some hosts try to connect to the A records of the domain (the bare
domain name resolves to webserver ips) instead of using the mx records,
and mail is refused because those (web)servers don't accept mail for the
domain. They are webservers, not mailservers.
I think most of the refused email is spam anyway, but I fear some
legitimate mail gets lost too... most notably from webmail clients.
One solution would be to relay mail to the real mailservers (dirty).
Another is just ignoring these hosts (doesn't happen often anyway) and
possibly loosing email (which I do now). I could try to contact the admins
of those hosts, but I'm not very hopeful... I especially want to make
sure that what I do is right, to cover my back when someone complains
about lost email. So...
What is the Right Thing to do here?
(I don't really expect one opinion ;) ).
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