OT postfix multiple instances and recipient verification

[Jason Ede]

I'm thinking of using multiple postfix instances to split up emails with multiple recipients (to make sure blacklisting and whitelisting works properly) and maybe to sign some outbound emails using domain keys...

>From what I've read on the postfix documentation I'll have an inbound postfix instance that just passes all email on internally via a port I specify to the next instance where MS does its work and then sends it on to the destination server. All of this seems relatively straightforward so far.

However, I use recipient verification to make sure we only accept emails that can be delivered. As the inbound postfix will not have any direct SMTP out then will this still work as it won't be able to check where the emails are going to as it just passes all emails on to another port? I could put a transports file in place, but surely that would contradict a relayhosts setting in main.cf?

Also have others used multiple instances like this before with MS and what is the performance hit in having multiple instances? Are there any gotchas that I need to be aware of?

Jason
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