Date: Wed, 8 Nov 2000 16:53:15 +0000 From: simond@irrelevant.org To: Glenn McCalley <freebsd@mail.bnetmd.net> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: MX-DNS-telnet sanity check Message-ID: <20001108165315.E56588@irrelevant.org> In-Reply-To: <Pine.BSF.4.21.0011081130350.66705-100000@mail.bnetmd.net>; from freebsd@mail.bnetmd.net on Wed, Nov 08, 2000 at 11:48:23AM -0500 References: <Pine.BSF.4.21.0011081130350.66705-100000@mail.bnetmd.net>
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On Wed, Nov 08, 2000 at 11:48:23AM -0500, Glenn McCalley wrote: > Hi all, more generic than FreeBSD, but hope somecan confirm/deny: > > We have a domain hosted on us, with an MX record pointing to another > ISP. Mail worked just fine until this Monday morning. At that time, mail > delivery through the MX'ed ISP went intermittent. By that, some mail is > delivered OK, some mail is not. > > "Other ISP" are claiming that our DNS is set up incorrectly. > domain.com. IN MX 0 mail.otherisp.net. > --seems pretty straightforward to us, and has worked for over a year. > > The basis of their claim is their statement that running: > > bash# telnet domain.com 25 > > -- does not connect to their mail server, the target of the MX entry, but > rather to the server where domain.com is housed. This is supposed to be > proof that our DNS MX entry is wrong. > > Personally, I didn't know that specifying port 25 on a telnet connection > would cause telnet to do an MX lookup and then connect to that address > rather than the address for "domain.com". Am I missing this or are they > blowing the smoke I think they are? Basically they're talking total rubbish, the only time that telnet domain.com 25 would be useful is if you had no MX records setup at all which'd cause mail to be delivered to the machine called domain.com. -- Simon Dick simond@irrelevant.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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