Hello,

I am now hosting a second domain on my email server and of course as it routes outbound email through relay.dynu.com it is rejected because that is set up for pbnj-solutions.com only. I cannot see how to configure Postfix to use a different outbound relay based on the sender's domain.

Can the relay service be setup to handle more than 1 domain?

Yes, if you have SMTP relay subscription for multiple domains, our server is configured to accept the login credentials of any of those domains.

You will need an SMTP relay subscription for each domain though, otherwise, our server will return '554 invalid from address' error. This is when you have subscription for only domain a and try to send emails for domain b.