On Tue, 1 Feb 2011 11:43:25 -0500, Victor Duchovni <victor.ducho...@morganstanley.com> wrote: > On Tue, Feb 01, 2011 at 05:33:14PM +0100, Ignacio Garcia wrote: > >> Hi there. Hi, I've been googling around all morning and I'm >> completely ignorant on what I'm going to ask, so please forgive me if I >> make no sense. I have 2 independent servers running >> postifx+mysql+(other_things) all controlled from a nice web interfacce >> called ISPConfig3. Those 2 servers are completely independent with many >> domains configured in each of them. Authentication is done against each >> server's separate and different mysql database. I'm testing Perdition >> for imap and pop3 connections so webmail access is more >> consistent/unified, and in case of customers with email services in both >> servers, we make it easier for them since the proxy redirects >> connections to the right imap server. My question: is there such a >> similar product (SMTP proxy) that can be configured in the same way to >> hide the real smtp servers and >> deliver/accept_mail_from_our_2_different_pools_of_users using the >> correct server? > > Well, the proxy won't know what to do before the user authenticates, > and you say the the authentication databases are split, so it is far > from clear how you expect this could work. > > However, if Perdition presents a unified IMAP interface, you could > perhaps use an "rimap" backend with Cyrus SASL to authenticate the > user. > > I am not aware of any SMTP proxies whose downstream SMTP server is > selected after user authentication. It is probably easiest to just > operate a unified submission server that authenticates the union of the > two sets of users, and then routes to the right server via sender-based > routing. In other-words, not a proxy but a store-and-forward MSA. > > Postfix can do that.
Victor, thanks for your quick response. yes, I did not take into account that authentication does not always take place in SMTP. So I guess that leaves me with no other option but to consider a round robin setup. However, I'm not sure how this works. Do I need to setup each postfix server to accept messages from/to both sets of users, or in this scenario, if the first connection fails, it'll try the second automagically? Can anybody point me to a tutorail, howto, etc. on how to setup postfix in a round robin environment? Thanks so much. Ignacio
