In message <458977.96237...@web53606.mail.re2.yahoo.com>, Fr34k writes: > > In message <barmar-ed15c5.21262028102...@news.eternal-september.org>, Barr > y > >Mar > > golin writes: > > > In article <mailman.585.1288263412.555.bind-us...@lists.isc.org>, > > > Tony Finch <d...@dotat.at> wrote: > > > > > > > On Thu, 28 Oct 2010, Gregory Machin wrote: > > > > > > > > > > My question is why would "IN MX 10 mcvpemr01" and "IN M > X > > > > > 10 mcvpemr02" be repeated trough the zone file surely this is > > > > > redundant ? > > > > > > > > Some hostmasters like to ensure that mail is not directed to hosts tha > t > do > > > > not listen on SMTP. They prefer misdirected mail to be rejected > > > > immediately rather than waiting days for the sending system to time ou > t. > > > > Some of my colleagues have this setup on the zones they manage > > > > (eng.cam.ac.uk and cl.cam.ac.uk). > > > > > > But configuring MX records won't necessarily accomplish this. It will > > > cause mail for all these hosts to be delivered to mcvpemr01 or mcvpemr02 > . > > > > And they can do a SMTP level rejection rather than waiting for the > > sending server to abandon sending the email due to multiple timeouts. > > Just return 550 for all mail directed to users at those hosts. It > > would be nice if we could standardise a MX target of "." as saying > > that this domain doesn't accept email e.g. "MX 0 ." the same way > > as "SRV 0 0 0 ." means that there is no service for the named > > protocol. That way the sending MTA or the MSA can reject the email. > > > > Hello, > > Is there an advantage to process email just to have the destination MX reject > it? > > Why not use " IN MX 100 localhost" so the email doesn't even leave the source > ? > > Or, am I confused?
Think about the error messages that will be sent. You want these to be meaningful. "550 User unknown. Please use u...@example.com instead." "550 User unknown. host.example.net is not a valid email destination." Messages about mailing looping, which is what you get when you say localhost, are not very informative. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
