Exchange POP Configuration

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Microsoft Exchange
I'm trying to setup users on a Exchange 2003 SP2 server to access email outside the office using POP. They do not want to use OWA. I added the POP3 protocol on the server and it works fine for receiving emails but when I try to send I get the following error. An unknown error has occurred. Subject 'TEST', Account: 'TEST', Server: '##.###.##.###', Protocol: SMTP, Server Response: '554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid', Port: 25, Secure(SSL): No, Server Error: 554, Error Number: 0x800CCC6F I've tried different settings in Outlook 2003 for authentication but I cannot send any emails through my POP configuration in Outlook. Internally, email with the Microsoft Exchange server settings works fine.
ASKED: November 2, 2005  12:42 AM
UPDATED: November 2, 2005  8:32 AM

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two thoughts
1, check your mail relay protections, you are probably disallowing mail relays (as you should) but that error does seem like a mail relay error.

2. it is also possibly a firewall error.
if your firewall does some smtp protocol cleanups exchange may break

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  • MrGee62
    It is my guess that you are trying to allow 'remote' users NOT directly connected to your network access to their email accounts. If this is the case, your incoming mail server will always be the server that hosts their email. Outgoing email will have to go through their local provider's smtp server. Example: incoming (POP3) mail server: mail.mydomain.com outgoing (SMTP) mail server: smtp.myISP.net Where smtp.myISP.net is the smtp mail server for their internet service provider. The ISP may or may not require login (an advanced setting) for their outgoing mail server. This works well, especially if you want to keep using Outlook for the email client, on 'stationary' or desktop computers. For mobile, notebook users the outgoing mail server will change depending on where they happen to accessing their email from at any given moment. I hope that this helps to clarify your needs. Gregg
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