* tejas sarade <tejas.a.sar...@gmail.com>: > Hello, > > I am trying to interpret two different MX lookup errors. > > 1) In first case Postfix generated NDR immediately and error message as > follows > > dsn=5.4.4, status=bounced (Host or domain name not found. Name service > error for name=aaa-rus.ru type=A: Host found but no data record of > requested type)
No A, no MX --> bounce $ host -t mx aaa-rus.ru Host aaa-rus.ru not found: 3(NXDOMAIN) $ host -t a aaa-rus.ru Host aaa-rus.ru not found: 3(NXDOMAIN) > 2) In the second case Postfix deferred the mail and retry to deliver mail. > > dsn=4.4.3, status=deferred (Host or domain name not found. Name > service error for name=bbbbbb-logistic.ru type=MX: Host not found, try > again) Temporary DNS error, thus retry. > In first case it generated NDR immediately while in second case > Postfix keep trying to deliver mail. > What is happening behind scene? -- [*] 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, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
