alxfrag tizablggmailcom hi strange problem sm modification smtp server ive modified smtp server user account ktrq2mydomain change address pretend wkgh6mydomain anyuseranydomain mail clients like mozilla horde display following message one users try forge address error sending message failed add recipient jndxmydomain smtp invalid response code received server code 553 response 571 sender address rejected owned user user1 sm says requested action taken mailbox name allowed server replied 553 571 sender address rejected logged message displayed even user1 try forge address im using sasl authentication smtp server ideas thanks advance alex wed 06 aug 2008 033851 0200 smusers strange problem sm