wie...@porcupine.org (Wietse Venema) writes: > Dave T?ht: >> wie...@porcupine.org (Wietse Venema) writes: >> >> > Dave Taht: >> >> So what I think I want to do is setup fallback relaying as follows: >> >> >> >> MX 5 mylaptop.example.org # if my laptop's up send mail there >> >> MX 10 mytinyarmbox.example.org # if not, try my arm box >> >> MX 20 mysmarthost.example.org # otherwise, default to my well connected >> >> host >> > ... >> >> Problem 1) I am under the impression from a foggy memory of reading some >> >> RFC or other, that at minimum, 2 MX records will be tried. So adding a >> >> third might introduce problems with some MTAs that ONLY do 2 MX records, >> >> in that far off day when more stuff speaks ipv6 directly, or when it >> >> fails to fallback to my third, primary smarthost. >> > >> > SMTP is defined in RFCs and the ones concerning SMTP are RFC 821, >> > RFC 2821, and RFC 5321. By now, most mail systems in existence will >> > be build after RFC 2821, which says "the SMTP client SHOULD try at >> > least two addresses". With three MX hosts you're operating outside >> > the recommendation. >> >> Many hosts seem to have more than 2 MX records. Gmail, for example, > > Unlike your unsupported configuration, gmail etc. do NOT require > that a client tries MORE THAN TWO addresses.
Gotcha. This morning I implemented a bind9 view that should be showing two MX records only, publicly, for teklibre.org, and shows three, internally. Mail is successfully getting routed through the arm box both incoming and outgoing, and queues up there when the main internal server is down. (I might have bounced a mail or two along the way, and if any further mail bounces, please tell me via a less-strangely routed email address: d...@teklibre.com) So... Postfix... Running out of flash... On an Arm... ***Running at 300 milliwatts*** Nice way to spend a weekend's hacking. Thanks for the help! -- Dave Taht http://the-edge.blogspot.com "Most people know my father as the despotic warlord that rules europa but he does have his amusing sparky qualities. Do you know he really loves waffles?" - Gil Wulfenbach
