Outlook won’t send email, it just sits in your Outbox

Ok, so first if you also can’t receive email, this isn’t your problem.  This is about a send only problem.  I could receive email just fine.

If your problem matches the helpful description here: http://www.slipstick.com/problems/outbox.htm

Also a similar article on Microsoft’s official Office support site here: http://office.microsoft.com/en-us/outlook/HA011879881033.aspx  

Then you have the same problem I did.  I wanted to specifically mention that it was LANDesk Antivirus causing the issue as that hasn’t (so far) been listed as one of the Outlook add-ins that causes this issue.

The registry key I had to modify was here:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\ LDOutlookAddin.Addin

This was installed with LANDesk Antivirus and is identified with the FriendlyName of "LANDesk Outlook add-in" and Description of "Scans email for viruses" (all items a user could search on.)  I'm running version 5.0.1.88 which I believe is the latest.

Once I set LoadBehavior to 0 it solved my issue.

Big thanks to Diane Poremsky for writing the post linked to above which helped me debug my issue.