unable to reach bsd-lists via mail

Matthew Seaman m.seaman at infracaninophile.co.uk
Sun Jun 19 06:22:57 UTC 2011

On 18/06/2011 23:29, Christopher J. Ruwe wrote:
> The mailer answers "220 mail.cruwe.de ESMTP Postfix" when telnet'ed, so
> I guess that is what the mailer returns as hostname.
> I did not know about that DNS/rDNS issue ...

You need the name your mail server HELOs as to resolve both forwards and
reverse ---

     mail.cruwe.de              IN A IN PTR mail.cruwe.de

That's the thing the FreeBSD mail servers look for[*].

You don't need an A record for cruwe.de at all (at least, not for the
purposes of sending e-mail) MX records are all that is required so that
addresses of the form @cruwe.de will work:

    cruwe.de IN MX 10 mail.cruwe.de



[*] This HELO name doesn't have to be anything to do with the e-mail
addresses you use, so you could take the lazy path and use
vs532.sys-central.de for this purpose seeing as it already has the
correct forward and reverse mappings.  Mind you, that means you won't be
able to insert SPF records or other e-mail related bits as the zone
doesn't belong to you.

Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
JID: matthew at infracaninophile.co.uk               Kent, CT11 9PW

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