Ah, much clearer now. Your assistance is appreciated. Regards, -David
> From: Wietse Venema <wie...@porcupine.org> > Reply-To: Postfix users <postfix-users@postfix.org> > Date: Tue, 26 Jan 2010 12:51:29 -0500 (EST) > To: Postfix users <postfix-users@postfix.org> > Subject: Re: Cost based routing > > DAVID HASSILEV: >> >> Thank your for the reply. While I am not too familiar (yet) with the Policy >> Daemons, it seems somewhat straight forward. What I do not understand in >> your suggestion is the multiple smtp_bind_address statements. It's not clear >> to me how that will effect delivery to separate smarthosts or relay hosts. >> We forward ALL mail to a relayhost owned by us, but via two different (one >> public and one private) routes. > > OK, if you're doing cost-dependent smarthost selection, then you > don't need smtp_bind_address statements. > > Instead, the policy daemon would reply with one of the following: > > FILTER smtp:[smarthost1] > FILTER smtp:[smarthost2] > DUNNO > > Also, no tweaking would be necessary at the routing level. > > Wietse > >> I do not wish to have multiple default routes to the outside, rather, I am >> only trying to force smtpd to deliver either via the relay host A or relay >> host B based on email size. >> >> I understand that I can force all non-local mail to deliver via >> relayhost=[a.some.domain] and alternatively >> smtp_fallback_relay=[b.some.domain]. >> >> I guess I'm still trying to determine whether I can force mail by size >> restriction via one relayhost or another. If this is done with the >> smtp_bind_address I guess I have much more reading to do. >> >> Hopefully that made sense. >> >> Regards, >> -David >> >> >>> From: Wietse Venema <wie...@porcupine.org> >>> Reply-To: Postfix users <postfix-users@postfix.org> >>> Date: Mon, 25 Jan 2010 14:57:32 -0500 (EST) >>> To: Postfix users <postfix-users@postfix.org> >>> Subject: Re: Cost based routing >>> >>> DAVID HASSILEV: >>>> >>>> Hello, I have tried to search through the list archives but have not found >>>> what I'm looking for so I thought I'd post to the list. >>> >>> To implement routing policies depending on message size, >>> >>> - Implement a Postfix policy daemon to examine the message size >>> attribute (invoked from smtpd_end_of_data_restrictions). >>> See: >>> http://www.postfix.org/SMTPD_POLICY_README.html >>> http://www.postfix.org/postconf.5.html#smtpd_end_of_data_restrictions >>> http://www.postfix.org/postconf.5.html#check_policy_service >>> >>> - Have the policy daemon respond with "FILTER A:" or "FILTER B:" >>> or "dunno". A and B are the names of smtp client entries in >>> master.cf, each with their own "-o smtp_bind_address=xxx" option. >>> See: >>> http://www.postfix.org/master.5.html (for "-o name=value) >>> http://www.postfix.org/postconf.5.html#smtp_bind_address >>> >>> This requires Postfix 2.7 snapshot 20100117 (or later). To make >>> this work you will also have to tweak the network stack to support >>> two "default" routes to the outside world. I can tell you only the >>> Postfix side. >>> >>> Wietse >>> >> >> >> >> > >
