Patrick Landolt:
> I try to get a setup like to following ready:
>
> 1. I have multiple ip postfix should be able to send mails to other MTA
> 2. I setup different transport in master.cf each with a smtp_bind_address
> corresponding to a single ip
> so far, so good! that setup already works
>
> But now I need to handle slow ISPs like yahoo etc. My first try is to add
> transport_maps with like
> yahoo.com slow:
This requires support for multiple criteria, in this case sender
and recipient. The only place that currently does this in Postfix
is the SMTP server policy protocol, which is implemented before
mail is queued. A sane implementation of what you want should be
done post-queue.
Strawman transport_policy:
- The client is implemented in the trivial-rewrite service.
- The protocol format is like the SMTP policy protocol: one line
per name=value attribute. This easy to parse in any language.
- The request contains one sender, one recipient, and perhaps other
information.
- The service replies with one transport, one nexthop, and one
recipient.
- Open question: how are the client requests placed in time relative
to transport_maps, sender_dependent_mumble_maps, and other routing
features?
Wietse
