[otrs] problems sending emails

Hi, I get no errors sending emails in OTRS, but I no receive any one. I saw in Mercury that all the messages are from otrs@localhost, and I think that perhaps Mercury needs a complete domain, because in the Core Process it says "invalid or illegal from address", but in the SMTP Server it seems to work fine. I try to change otrs@lcoalhost to other email changing STMP.pm and Sendmail.pm modules in my Win 2000 Server and then restart all the services with the same results. I not receive any message in my email account, but OTRS send it with no errors. Thanks for your help. Best regards Adrián Deccico