None of your email accounts could send to this recipient

Running Exchange 2007 SP2, Outlook 2007 SP2.

One of my users is having problem sending emails to user@contoso.com. The NDR is "None of your email accounts could send to this recipient". Other users don't have this problem, and the user could send to the recipient a few days ago ok.

I ran message tracking on our Hub Transport server, and there is no mention of my user trying to send to user@contoso.com, so it looks like the message is not even getting to Exchange, seems to be Outlook blocking it?

Have send KB here, but doesn't apply: http://support.microsoft.com/kb/872896

Any ideas?
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bruce_77Asked:
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LLMorrissonCommented:
Yes you need to change it to SMTP. It should remember the entry going forward, but if not, use the technique I described above to remove the entry from your autocomplete. (ignore the part about the GAL obviously). Then when you type in the address the next time it should just be set correctly.
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LLMorrissonCommented:
Has the user got a contact for this person in their address book that is overriding the object in the GAL? If so check to see that the address configured for that contact is of a valid type.

Maybe also its something malformed in his auto-complete cache. Have him open a new email and start typing the address of the offending recipient. When it offers the suggestion for the recipient, highlight it with the mouse and then press the Delete key (not backspace). This will remove the entry from auto-complete. Now try typing the name again and press ALT + K to have Outlook look up matching entries in the GAL.

Also try, when the email fails, opt to "Resend This Message" then double click the offending email address, click the "Internet Type" button to change type to SMTP then click OK and try sending again.
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bruce_77Author Commented:
This is an external user, so not in the GAL.

"Also try, when the email fails, opt to "Resend This Message" then double click the offending email address, click the "Internet Type" button to change type to SMTP then click OK and try sending again."

Tried this, the Email Type was set to MAIL TO. I assume we need to change this to SMTP? And what is this a property of, the auto-complete entry? If I change that value to SMTP, will that change that value for this entry going forward?
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