There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <mail.SERVER.com #5.5.0 smtp;550 sorry, mailbox
When one of my users tries to send an email to a specific address, he gets this error message:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<ouremailserver.com #5.5.0 smtp;550 sorry, mailbox unavailable (#5.5.0)>
I have tried to telnet to the destination smtp server and get the same error when I tried to manually send and email the the specific address
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<ouremailserver.com #5.5.0 smtp;550 sorry, mailbox unavailable (#5.5.0)>
I have tried to telnet to the destination smtp server and get the same error when I tried to manually send and email the the specific address
http://support.microsoft.com/default.aspx?scid=kb;en-us;q300171
"The problem may be that all mail is forced through this relay bridge, and some recipients simply do not accept relayed mail. They view it as possible spam, and reject it."
ASKER
I get the same error message when I try to directly connect to the destination server if I am on Exchange server or outside our firewall.
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I'm with BBRazz. This isn't a problem on your server. Contact the recipient by other means and confirm the address, they can raise it with their own IT department if the problem persists.
Chris
To what I added earlier, their side needs to accept your incoming relayed messages. They are most likely being blocked as spam.