On Thu, Dec 08, 2022 at 04:01:26PM +0000, Sean Hennessey wrote:
> As is sometimes the case, this has turned a bit into going down a
> rabbit hole. I find the case now that it would be "really nice" to be
> able to also throw from addresses in the loop here. So basically, if
> the from address is a...@somewhere.com, then I want to relay X% of
> traffic to one relay as I've got working below. I looked at the
> pgsql_table man page, but it looks like it only takes in the to
> address for the %s for the transport map. I'm assuming there is other
> maps I can do for the from address, but I'm not sure if it's possible
> to create something that chains them together. I'm going to dive into
> the postfix.org docs to see if anything pops for me, but I figured I'd
> throw this out there in the hopes that better minds then I might have
> some ideas.
Sorry you can't chain lookups on sender *and* recipient addresses (more
generally multiple input keys), and to avoid lots of possible mistakes,
probably shouldn't anyway.
What you can do with sender addresses is configure per-sender *default*
transports, but these only apply when the recipient is for a remote
domain, and has no explicit recipient-specific transport setting.
The only way to chain these is multiple Postfix instances, where the
default transport for some recipients sends mail to separate Postfix
instances that are warming up some recipient domains, while all other
senders are delivered normally (direct-to-MX with no transport
overrides).
--
Viktor.
