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After viewing the Outbox, the messages in it won't send
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If you click on the Outbox while messages are waiting to be sent, the messages are marked as read and won't send.

This is caused by a Net framework add-in you have installed that 'reads' Outlook items, including the Send to OneNote from Outlook PowerToy add-in and BCM (Business Contact Manager). A list of other add-ins known to cause this behavior is listed below.

To send the affected messages, you'll need to open the message, then switch to a different folder before clicking Send on the message. Do not go open the Outbox until after the messages are sent.
  To identify the add-in that results in this behavior:

Look in Tools, Options, Other, Advanced, Com add-ins. Disable the add-ins and re-enable them one at a time and test.

Since BCM and possibly other add-ins are not listed in the COM add-in list, check

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins
  • HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins
    •

    Export the keys then change the LoadBehavior value to 0 to disconnect an add-in. Restart Outlook and test.

    Applications responsible

    The following is a list of some of the applications which are reported to cause message to be marked as read. If you use these or any other add-ins, check for a newer version - newer versions of some of these applications will not cause problems. 

  • ICQExpress (COMAddin), installed as part of ICQ
  • Business Contact Manager (BCM)
  • Send to OneNote from Outlook PowerToy
  • Outlock
  • Outlook Backup Add-in
  • Sierra Wireless Outlook Integration - disable in the registry. It's listed at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\SwiOutlookInt.Addin
  • ONFOLIO
  • Timeslips add-in
  • Attensa for Outlook. Check for upgrade: newer versions not affected.
  • Cisco Meetingplace plug-in
  • MindJet Mind Manager 6. Disable the add-in in the registry - the key is Mindjet.Mm6OutlookLinker.AddIn.2
  • Google desktop "search your own computer", specifically because it searches the mail
  • ScanSoft PDF Converter Outlook Addin
  • Norton AntiSpam Outlook Plugin
  • Norton Internet Security
  • AIM Sync
  • LinkedIn Outlook Toolbar
  • Salesforce
  • Upshot Outlook integration
  • MS CRM 3.0 Outlook Add-in
  • Xobni - Upgrade to the newest version of Xobni.
  • Auto-Mate
  • RingCentral Add-in
  • DesktopSMS.Addin
  • ABBYY PDF Addin
  • iTunes Outlook Addin
    •
       

    More Information

    		 If your mail won't send and it's not the problem described above, other possible causes are:
  • Authentication problems: Are you logging on to the mail server correctly?
  • No default mail account. If you can reply to messages but not send new message, check the account settings and make sure one is set as default. When you use a configuration script created by your mail provider or import accounts, an account is not always set as default.
    •  See Email Won't Send - Common Causes for more information.
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