Am 05.12.2013 15:26, schrieb Roman Gelfand: > I am not sure I understand. I am sending out email from postfix. > Postfix looks up the target domain mx record. Are you saying the > domain the target domain's dns server varies response based on query > source ip address?
the dns root ( which is the dot ) has no A record so there is no place to send to, so the lookup results in error which kind of error may differ and relate to software/version/lookup failure code etc additional there is a rfc draft http://tools.ietf.org/html/draft-delany-nullmx-00 ... The NULL MX Resource Record To indicate that a domain never accepts email, it advertises a solitary MX RR with a RDATA section consisting of an arbitrary preference number 0, and a dot terminated null string as the mail exchanger domain, to denote that there exists no mail exchanger for a domain. ... hope i am right here, perhaps gurus may give better or additional help > > On Thu, Dec 5, 2013 at 1:34 AM, Robert Schetterer <r...@sys4.de> wrote: >> Am 05.12.2013 03:12, schrieb Roman Gelfand: >>> Supposedly, the recipients are getting their emails from other >>> senders. However, when sending email from postfix, I get mx >>> malformed bounce. >>> >>> I did a dig on mx record for that domain and got... >>> >>> enlglobal.com. 300 IN MX 0 . >>> >>> Is this legit? If yes, what is the mail server? what do I need to do >>> for postfix to recognize it? >>> >>> Thanks in advance >>> >> >> as far i remember... >> normally this is a trick from the domain owner ,to say no mail for that >> domain ( avoid typos etc ), if postfix did an error everything is fine, >> you dont need to do anything, if you like mail from that domain dns >> record should be changed >> >> >> Best Regards >> MfG Robert Schetterer >> >> -- >> [*] sys4 AG >> >> http://sys4.de, +49 (89) 30 90 46 64 >> Franziskanerstraße 15, 81669 München >> >> Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 >> Vorstand: Patrick Ben Koetter, Axel von der Ohe, Marc Schiffbauer >> Aufsichtsratsvorsitzender: Florian Kirstein Best Regards MfG Robert Schetterer -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Axel von der Ohe, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
