On Wed, 16 Oct 2002 11:37:11 +0100, Tom Coady wrote: > From: "Tony Nugent" > > Their mail server(s) will not accept email if the email address you > > are sending from is unresolvable in the dns. > > And rightly so. However I believe my address is resolvable otherwise I > would receive no incoming mail, That's something different, because in your case there are MX records for dsl.pipex.com (which does not resolve and hence could not handle incoming mail!) and when those mail exchange servers (which do resolve) accept mail for your address, you receive mail. $ host -a dsl.pipex.com ns0-d.dns.pipex.net | grep MX dsl.pipex.com. 600 IN MX 4 roadshow.systems.pipex.net. dsl.pipex.com. 600 IN MX 4 funhouse.systems.pipex.net. dsl.pipex.com. 600 IN MX 4 whirlwind.systems.pipex.net. (For the previous query I didn't get them, because they expire very often). 250 mx1.redhat.com Hello x [x.x.x.x], pleased to meet you MAIL FROM: test@dsl.pipex.com 550 5.0.0 test@dsl.pipex.com... You msut use a valid mail server MAIL FROM: test@blubb.dsl.pipex.com 550 5.0.0 test@blubb.dsl.pipex.com... You msut use a valid mail server (and now one that resolves) MAIL FROM: test@pipex.net 250 2.1.0 test@pipex.net... Sender ok > and the strange thing is that redhat > accepted my mail for several weeks before they suddenly started > rejecting stuff. Could it be that anything changed at your end?
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