When I send an email to an account on my exchange 03 server from an external email address that requires authentication and uses port 587 I don't get the email on the exchange server account. I receive from a different accout that uses port 25 just fine. What do I do?

Check this article. You will have better understanding on port 587 http://www.pcmag.com/article2/0,2817,1838667,00.aspRaj

This is a known issue with Outlook Express on Windows XP and Windows Server 2003 and Windows Mail on Windows Visa. The fix is here: A mail program cannot connect to an Exchange Server 2007 server by using SSL over SMTP port 587http://support.microsoft.com/kb/933612 Alternatively you could use Mozilla Thunderbirdhttp://www.mozillamessaging.com/en-US/ MCTS: Messaging | MCSE: S+M | Small Business Specialist

Please read the articles provided by the friends above. Port 587 is used for internal user to submit email in most situation. I guess you mean your mail client can’t connect to Exchange via port 587? What’s your mail client?

This is a known issue with Outlook Express on Windows XP and Windows Server 2003 and Windows Mail on Windows Visa. The fix is here: A mail program cannot connect to an Exchange Server 2007 server by using SSL over SMTP port 587http://support.microsoft.com/kb/933612 Alternatively you could use Mozilla Thunderbirdhttp://www.mozillamessaging.com/en-US/ MCTS: Messaging | MCSE: S+M | Small Business Specialist I actually submitted this to Microsoft all those years ago. I was soooo glad when the fix finally came out!Oliver Moazzezi | Exchange MVP, MCSA:M, MCTS:Exchange 2010, BA (Hons) Anim | http://www.exchange2007.com | http://www.exchange2010.com | http://www.cobweb.com |