[IMail Forum] Possible SPAM relay attempt?

[Ricardo Freire]

Hi,   I'm not an expert in mail protocols, but I think it might be an attempt to use my SMTP server as relay for SPAM (the suspect IP/domain belongs to a small computer store). My SMTP is configured to relay only for my addresses, and to "refuse NULL senders" (as you can see below).   (...) 07:26 20:03 SMTPD(008700F6) [(my server)] connect XXX.XXX.XXX.XXX port 1993 07:26 20:03 SMTPD(008700F6) [XXX.XXX.XXX.XXX] EHLO suspect-domain.com.br 07:26 20:03 SMTPD(008700F6) [XXX.XXX.XXX.XXX] bogus address in MAIL FROM:<> 07:26 20:03 SMTPD(008800F6) [(my server)] connect XXX.XXX.XXX.XXX port 2024 07:26 20:03 SMTPD(008800F6) [XXX.XXX.XXX.XXX] EHLO suspect-domain.com.br 07:26 20:03 SMTPD(008800F6) [XXX.XXX.XXX.XXX] bogus address in MAIL FROM:<> (...)   Before I contact the suspect-domain administrator, could you please tell me if it is really a SPAM-relay attempt?   Cheers, Ricardo Freire, MCP