From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2002-09-11 13:27:35
firstname.lastname@example.org 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 <email@example.com>... 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 Message was sent through the cbm-hackers mailing list
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