manual mail-routing for single domain

[shanti]

Hi

I need to implement a manual routing for outgoing emails to a certain non-local domain:

is the following syntax correct, and how to integrate it ?

ams.at:
driver = manualroute
domains = ams.at
transport = remote_smtp
route_list = ams.at mailx13.cna.at:mailx16.cna.at:mailx17.cna.at:mailx18.cna.at randomize

thanks for help

best regards
-c-