Can send mail by using Outlook on MS Exchange server 2003
Posted on 2011-05-09
This is using MS Exchange 2003. A user using OE pop/smtp method was found unable to send mail with the following error messages:
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'email@example.com'. Subject 'test', Account: 'a.com', Server: 'b.com', Protocol: SMTP, Server Response: '554 Recipient address rejected: User unknown', Port: 25, Secure(SSL): No, Server Error: 554, Error Number: 0x800CCC79
However he able to receive, what's wrong. BTW, sending to internal is not an issue.