So I am a huge fan of these odd ball issues. When one of my users called me telling me they couldn’t send a “few” messages to people I told the helpdesk I was going to look into it myself.
They got this NDR back:
“None of your e-mail accounts could send to this recipient.”
Now I have never seen that error before, and what really got my interest was there was no x.x.x error code. This lead me to think it was a local issue with the client.
Some Google searching lead me to think it had to do with missing message connectors (like fax, etc..) but this user didn’t have any of that.
Some times it really helps to just talk to the end user. After speaking to her we discovered this only happened when clicking a mailto: hyperlink from a forwarded email down in the thread.
When I went back to my desk I noticed that my FROM: tags were not hyperlinked like the ones from my user.
After comparing the differences I finally noticed that she had the SalesForce.com plug-in installed. What it is doing is actually sending outlook a email type of “MAILTO” instead of SMTP.
After pressing ALT+K you can double click the resolved address and see what the email type is. If its set to MAILTO it will not work. You can however press the internet type button and it will change it to SMTP (which will allow it to send).
So there is no real solution right now, I am going to check with SF.com enterprise support but I have a feeling they wont do anything about it. After showing the end user what not to do and showing how to correct it she was happy enough with the solution.
If you find the same problem or any other add-on causing this please let me know so I can add it to the list.
UPDATE: Thanks to Andrew down there in the comments Outlook 2007 has been patched by MS: http://support.microsoft.com/kb/2475888/en-us
UPDATE 2: Thanks to Tom, we now know MS is hopefully rolling out a patch for Outlook 2010 sometime this month (fingers crossed).
UPDATE 3: I just saw there might be a fix for 2010 you can test out this hotfix from MS. If it works let me know in the comments: http://support.microsoft.com/kb/2475888/en-us or possibly http://support.microsoft.com/kb/2597052.