http://www.msexchange.org -------------------------------------------------------Not related to IMF at all. "504 Need to authenticate first" - that's pretty clear; the destination server requires authentication. Have you defined that connector as requiring authentication? -----Original Message----- From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Andrew English Sent: Saturday, May 20, 2006 10:56 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: SMTP issues Hi, I am having some issues with the SMTP server, when it sends emails to certain servers online it reports the following error: This is an SMTP protocol error log for virtual server ID 1, connection #702. The remote host "67.69.144.11", responded to the SMTP command "xexch50" with "504 Need to authenticate first ". The full command sent was "XEXCH50 1036 2 ". This will probably cause the connection to fail. I have yet to figure out why this is?? I am using Exchange 2003 with SP2 and IMF v2. Regards, Andrew All mail to and from this domain is GFI-scanned. ------------------------------------------------------- List Archives: //www.freelists.org/archives/exchangelist/ MSExchange Newsletter: http://www.msexchange.org/pages/newsletter.asp MSExchange Articles and Tutorials: http://www.msexchange.org/articles_tutorials/ MSExchange Blogs: http://blogs.msexchange.org/ ------------------------------------------------------- Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------- To unsubscribe visit http://www.msexchange.org/pages/exchangelist.asp Report abuse to listadmin@xxxxxxxxxxxxxx