I have BM 3.6 with SP2 used as a mail proxy for a branch office with
Internet access. I use mail proxy to attend the branch office users and
re-directed to public interface of a Unixware Send Mail server in central
office. Everything works fine for almost every destination domains. Users
also receive their message via POP3 normaly. In the last weeks i'm having
some mails directed to some domains, rejected to the sender (remote
office users). I also, notice that this domains doesn't have an MX entry
in Internet DNS's (some of them are hosted by ISP) and .CTL files in
spool\outbound directory have a warnning stating "Didn't use HELO
Protocol". Any clues?

Thanks for your help.

Hector Lopez.