From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2002-09-11 13:27:35
ruud.baltissen@abp.nl wrote:
> Sorry to bother you all but I sent an email to Marko at three different
> addresses for some days and all were returned with the following message:
The administrators of our university network have tightened the
configuration of the mail servers in order to better block unsolicited
messages.
> (reason: 550 5.7.1 <marko.makela@hut.fi>... We don't accept connections
> from unresolvable addresses. Fix your reverse DNS for XXX.XXX.XXX.XXX, or
> use your ISP server.)
It would be easier to trouble-shoot this if you disclosed the address.
For now, let us denote the numerical IPv4 address with A.B.C.D. The
error message specifically means that the name D.C.B.A.in-addr.arpa
cannot be resolved. If the address refers to a computer that is
maintained by you, you should change its configuration in such a way
that it does not directly try to initiate SMTP connections to outside
hosts; instead, it should use send the messages to the SMTP server of
your Internet service provider (ISP) for relaying. And that server
should definitely have a reverse DNS entry. In my opinion (and probably
also in the opinion of our network administrators), all visible IP
addresses should have reverse DNS entries.
Marko
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