Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!uunet!mcsun!hp4nl!ruuinf!praxis!edwin From: edwin@praxis.cs.ruu.nl (Edwin Kremer) Newsgroups: comp.protocols.tcp-ip Subject: Re: Curious SMTP behavior Message-ID: <2556@ruuinf.cs.ruu.nl> Date: 2 Mar 90 07:59:00 GMT References: <48f06f20.20b6d@apollo.HP.COM> Sender: news@ruuinf.cs.ruu.nl Lines: 27 In article <48f06f20.20b6d@apollo.HP.COM> mishkin@apollo.HP.COM (Nathaniel Mishkin) writes: | I'm trying to figure out why I'm having difficulty talking to certain | SMTP servers. Here's a sample dialog (output from my SMTP client): | >>> MAIL From: | 451 Nameserver timeout during parsing | Does anyone out there know what the SMTP server is trying to do that | might induce it to print out that message? I've seen a (almost) similar behaviour on our sendmail daemon some time ago: it happened if sendmail was able to find the IP address for the domain it was resolving (in this case "apollo.com") *but* was unable to find MX records for that domain. By then, I concluded that it must be silly to define an IP address in the nameserver, and not to add MX records. Well, I just DIGged "apollo.com" and... yep, no MX records. Hope this helps, --[ Edwin ]-- -- Edwin Kremer (SysAdm), Dept. of Computer Science, Utrecht University Padualaan 14, P.O. Box 80.089, 3508 TB Utrecht, The Netherlands Telephone: +31-30-534104 | UUCP: ...!uunet!mcsun!hp4nl!ruuinf!edwin Telefax : +31-30-513791 | Email: edwin@cs.ruu.nl [131.211.80.5]