troubleshooting Question

New problem sending email.

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TallensFlag for United States of America asked on
9 Comments1 Solution671 ViewsLast Modified:

Starting yesterday my users have begun receiving the following when sending to certian domains.

The following recipient(s) cannot be reached: on 7/24/2008 10:02 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            < #5.5.0 smtp;550 use the proper MX please>

I've checked our DNS and MX records at mxtools and dnsstuff and they all seem to be in order.  Any suggestions would be appreciated.
Rajith Enchiparambil
Office 365 & Exchange Architect

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