What do MX records have to do with outbound SMTP delivery? Do you mean that if the webserver cant relay to to first MX record then try the secondary mx records? This still has the primary server trying and many recipients dont have multiple mx records or some that do dont always have them on different networks :)
On Tue, Apr 7, 2015 at 10:59 AM, Johann Klasek <[email protected]> wrote: > On Tue, Apr 07, 2015 at 10:30:36AM -0400, chris wrote: > > I have a few linux webservers and which each send out SMTP directly . > > Currently, the webservers all relay the message directly to receipient > and > > if it cant then it sends back a NDR to the sender advising the sender the > > message could not be delivered. > > > > I want to scale this out a bit and add 2 "backup" SMTP server but what I > > want to do is have the webservers try to deliver the message and also > have > > both SMTP A and SMTP B as backup relays and I want it so that if the > > webserver cannot deliver the message directly then have it try SMTP A, > this > > server would keep the connection to webserver open and attempt to relay > > right away and if it fails REJECT the message so the webserver will try > the > > next server SMTP B etc etc. > > A rather similar behavior has Sendmail with a FALLBACK_MX setup, in > m4-style (for .mc file): > > define(`confFALLBACK_MX', `fallback.mydomain')dnl > > fallback.mydomain may consist of MX entries pointing to SMTP-A and SMTP-B > ... > To suppress MX lookup, you have to write > > define(`confFALLBACK_MX', `[fallback.mydomain]')dnl > > > I am just wondering if anyone knows how to do this or something like it. > As > > far as MTA I am familiar with exim,postfix,sendmail and not tied down to > a > > specific one so whichever gives this functionality is fine. > [..] > > I hope, Sendmail is at least one possibility. ;) > > > -- > Johann E. Klasek Zentraler Informatikdienst - Kommunikation > Technische Universität Wien Tel: +43 1 58801- 42049 > A-1040 Wien, Wiedner Hauptstr. 8-10/020C Fax: +43 1 58801-942049 > PGP: http://pgpkeys.tuwien.ac.at/ - jklasek - Key ID 37159641 > *** There are three kinds of people: men, women, and unix. *** >
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