I believe this is an issue that would require those users to use authenticated SMTP... do they not have the option to authenticate to the smtp server (in this case your exchange server) in their client?
-----Original Message----- From: Network Issues [mailto:[EMAIL PROTECTED]] Sent: Thursday, January 03, 2002 3:20 PM To: Exchange Discussions Subject: Open Relay Issue Goodafternoon All, I was informed yesterday that we were blacklisted by ORDB.ORG as they had determined our email server was an Open Relay. Well, I verified that this was the case and proceeded to research a way of closing the hole. I finally decided to heed the advice of the following article and reconfigured our Exchange box (http://www.exchangeadmin.com/Articles/Index.cfm?ArticleID=7696). Unfortunately, since that change was made I have had a few ticked off users. Basically, these are internal Macintosh users using Outlook Express to access their email. To make a long story short, Outlook for Macintosh will not run on their Mac's due to conflicts with some software. Outlook Express is configured to access Exchange via POP3. Each time they attempt to send email outside of the company, they get a 550 Relaying Not Allowed error message. The same issue occurs with an AS400-based web app we are running. It sends out email replies to customers who make reservations online. It too uses POP3 to access the Exchange box and it also receives the same error message. What can I do to enable these systems to access our Exchange box via POP3 and not open the security hole that makes our system an Open Relay? Our current Exchange configuration is as follows: NT Server 4/SP6a Exchange 5.5/SP4 TIA Ron _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
