On 2/14/2013 6:23 AM, Dominique wrote: > On 02/13/2013 03:24 PM, Noel Jones wrote: > [snip] > - Use some third-party relayhost service, such as dyndns. This will > not be free, but shouldn't cost very much. If you have more than a > couple dozen email addresses, this will be cheaper than a google > apps account. > > -- Noel Jones > [snip] > > I finally went with dyndns. Low cost for the volume we have and easy > to setup. > But since the price is volume based I was thinking of splitting the > outgoing trafficbetween my ISP and dym.com > > I thought of using relayhost to my ISP by default and use > fallback_relay when the ISP failed. However the documentation of > fallback_relay mentions only that it kicks in when then main relay > fails. In my case I want to use it when it bounces the mail for the > wrong reason (reason why I went with dyn.com in the first place): > > Feb 4 14:20:57 www postfix/smtp[6592]: 6CF7EA41F89: > to=<servic...@dominio.com>, > relay=smtp.movistar.es[213.4.149.228]:25, delay=3.4, > delays=0.15/0.01/0.26/3, dsn=5.2.0, status=bounced (host > smtp.movistar.es[213.4.149.228] said: 552 5.2.0 > wDHP1k00B3cN3cx1hDHPt5 internal error ??. 6007 (in reply to end of > DATA command)) > > Would it work ?
No, fallback_relay is for when the preferred destination is unreachable. When the primary (incorrectly) rejects your mail, your options are somewhat limited. One ugly-hack workaround is to add soft_bounce=yes to the master.cf smtp transport entry, which will transform the 5xx reject into a 4xx retry, and hope the relay will accept the message on the next try. This can cause the unwanted side effect that if a message is persistently undeliverable it will hang around in your queue for $maximal_queue_lifetime (default 5 days). #master.cf existing smtp transport entry smtp unix - - n - - smtp -o soft_bounce=yes Hmmm... Now that I think about it, the soft_bounce setting should trigger a fallback_relay delivery attempt. Give it a whirl. And complain loudly to the ISP when the service you're paying for isn't working. -- Noel Jones
