AIX - Sendmail - add hostname to subject of outgoing mail

Hello, I'm configuring sendmail on an AIX 7.1 server (bos.net.tcp.client 7.1.1.15).

I've gotten sendmail to send mail through our Novell GroupWise server, so that mail from a user on the server appears to come from their GroupWise account, and replies to the email would go to their GroupWise mail.

I'd like to have sendmail automatically prepend the hostname to the subject of each email it sends. Are there any sendmail gurus out there who know of a way to do this?

Thank you!