[HECnet] Multinet Mail

I wasn't sure where to post this question, so I thought I would start here. I have two simh vax3900 machines. Larry and Moe. Larry is the HECNet router for Moe. When I send email from Larry (via SMTP), the *return *email address is correct (SYSTEM at LARRY.MYDOMAIN.COM. When I send email from Moe (to LARRY::SMTP%"user at domain.com"), the return email address is: SYSTEM at SCSSYSTEMID.MYDOMAIN.COM. Why is Moe using the SCSSYSTEMID instead of the system name? *I am missing something.* *Kurt*