I have an error message getting returned to me from a website which would appear to be something wrong with the Server side. However, this server works for all other sites on the box. Is there a possibility that I (Developer) am doing something wrong? I have no idea where to to start to track this down on the server and my sysadmin says everything appears normal:
The following recipient(s) cannot be reached: Customer Service Account on 6/3/2009 11:00 AM There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <fgdc.myservername.net #5.5.0 smtp;550 Requested action not taken: mailbox unavailable>
Server is 2003, 64-bit and running Exchange 2003
Site is Asp.Net C#, using URL Routing
Where would I start to troubleshoot this?
As it turns out, my system administrator traced the problem down to a layer of Spam protection. Turns out MIMESweeper may be throwing the message away, as it sees the message from our web server farm trying to send an email out with an internal address. We tested external addresses (gmail, hotmail, etc) and it worked Fine.
Thanks for all the answers. As it turns out, the best answer was "Talk to your System Admin" from my perspective... but I thought I'd update the question for anyone out there with something similar.