multiple email servers with authentication

[AJ Weber]

I am attempting to configure multiple (backup) mailserver's. Each has a 
unique username and password, and in fact, each has different ports, 
protocols, etc.

I have tried this:

set mailserver smtp.domain1.com port 587
username address@hidden password "xxxxxxxxxx"
with timeout 30 seconds,
smtp.domain2.com port 465
username otheruser password "yyyyyyyyyyyyyyyyyy"
using SSL with timeout 30 seconds

This results in a configuration syntax error.

Can someone help me figure out how to configure my mailservers?

Thanks!

-AJ