Forward some messages based on condition to another SMTP server

[tiredofit]

I am trying to match my postfix configuration, which allows for adding to transport_maps a file with regular expressions to allow for routing to other domains. My use case is that hotmail|msn|live|outlook domains are very strict for filtering, and I use a third party SMTP to deliver those messages like so:

/.*@hotmail.*/i             smtp:[smtp.secondarymta.com]:587
/.*@outlook.*/i             smtp:[smtp.secondarymta.com]:587
/.*@live.*/i                smtp:[smtp.secondarymta.com]:587
/.*@msn.*/i                 smtp:[smtp.secondarymta.com]:587

I provide authentication to that secondary mail server via smtp_sasl_password_maps like so:

[smtp.secondarymta.com]:587 smtp_user:super_secure_password

Any advice on replicating would be welcomed

[mdecimus]

Yes, this can be done using SMTP routing rules. Check the routing section on the documentation for examples.