Marko Horn:
> better i start at the beginning:
>
> on my psotfix machine at example i have 2 domains = test-1.de &
> test-2.de
You are using one Postfx system to SEND email with a sender address
in one of two domains.
> i setup for test 3 Mailout-Gateways.
>
> test-1.de should NOT go thru these 3 mailout-gateways
The Postfix machine should send that email directly to the recipient's
mail server.
> test-2.de should GO thru these 3 mailout-gateways...
The same Postfix machine should send mail from the second domain
through three gateways.
> BUT, i want to distribute the test-2.de mail to the 3 mailout-gateways
> by round robin.
Unfortunately this cannot use
sender_dependent_xxx_maps = randmap:{...}
because that would send all messages through the three gateways.
Solution 1: use a fake multi-address gateway:
sender_dependent_default_transport_maps =
inline:{{@test-2.de = smtp:gateways.example.com}}
Where gateways.example.com has three IP addresses in DNS or in
/etc/hosts (the second variant requires "smtp_host_lookup = dns, native").
The Postfix SMTP client will try all three IP addresses in random order,
if the sender domain is test-2.de, otherwise it will use the default
setting (default_transport = smtp) and send mail directly.
Other solutions involve "sender_dependent_default_transport_maps =
tcp_table:..." or "sender_dependent_default_transport_maps =
socketmap:..." and are more painful to deploy,
Wietse
