From: Simon White (no email)
Date: Fri Nov 01 2002 - 08:36:05 EST
01-Nov-02 at 14:22, Marc Owen () wrote :
> 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.
Quite.
> I think most of the refused email is spam anyway, but I fear some
> legitimate mail gets lost too... most notably from webmail clients.
They are broken clients, this is not your problem.
> 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?
The Right Thing RFC wise is to do nothing, and let the admins do
something about it. Just because it works for some domains who *happen*
to have A records which work for mail, you should not work around it and
cause grief to other admins.
You should be able to write - if you get no
response you can safely say that it's unlikely to be legitimate mail.
I find a workaround attitude to these problems only serves to prolong
the agony in the long run.
-- [Simon White. vim/mutt. . GIMPS:74.29% see www.mersenne.org] All this talk about everyone being connected to the Internet by the year xxxx ignores the simple fact that a large number of people in the world are fighting for survival. - To unsubscribe, send mail to with content (not subject): unsubscribe postfix-users
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