Exchange 550 NDR only affects some users

50 pts.
Tags:
Microsoft Exchange 2003
Non-Delivery Reports
I'm gettng NDRs for only a handful of accounts when sending email. It does not matter which domain is being emailed. In other words, all outgoing (non-local) email gets the following NDR Your message did not reach some or all of the intended recipients. Subject: Account Lockout (Event ID: 539) Alert on SERVER Sent: 5/5/2008 12:24 PM The following recipient(s) could not be reached: sales@XXXXXX.com on 5/5/2008 12:24 PM There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <XXXXXXXX.org #5.5.0 smtp;550 you are not allowed to send mail to <sales@XXXXXX.com>> Other accounts have no problem emailing the exact same user account.

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