Re: [Exim] exim + smtp reverse dns

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Author: Suresh Ramasubramanian
Date:  
To: Eric Renfro, exim-users
Subject: Re: [Exim] exim + smtp reverse dns
psi-jack@??? (Eric Renfro) [Friday, September 20, 2002 3:39 AM]:

> Hey, I'm wondering how I could get Exim4 to, by default, not allow
> non-reversable DNS entries, and also no MX entries in DNS, for all
> SMTP<->SMTP traffic, except authenticated users.


It is perfectly acceptable to have only an A and no MX record. In fact, if
you see most universities / large organizations where people have the option
of getting mail delivered to their own workstations rather than to the
university mailhub, all they need is an A record.

> After weeks of looking at why spam is marked as spam, I've pretty much
> figured that pretty much all that spam comes from non-reversable IP
> addresses.


Well, you won't really find that a reliable metric I think - but as you
please.

    -srs