It appears that this message is a way that the target server responds to email not found.
Thanks for everyone's help on this. On Thu, Jul 18, 2013 at 12:54 PM, Wietse Venema <wie...@porcupine.org> wrote: > Roman Gelfand: >> I am sorry. I posted this only to Stan before. Looking at the >> rejected line, it seems to be postfix/smtp. >> >> 550 #5.1.0 Address rejected. (in reply to RCPT TO command) > > Wietse: >> THAT is qmail not Postfix. > > Roman Gelfand: >> would you have more info on this, as far as, how to go about >> researching this? > > Ask the person responsible for this system why they reject this > recipient. > > Wietse