Dear Everybody, I setup IMP 3.0 + Horde 2.0 + RH 7.3 . I can receive message from any POP3/IMAP server but when i send message from IMP I got this error : 'Warning: Mailbox is empty (errflg=1) in Unknown on line 0 ' I do not what to do next !Pls, help me some opinions . TIA -- Best regards, T.Q.Huy mailto:huytu@hcmc.netnam.vn