The cause may have something to do with the overall integration of Windows Search into the program which needs to be disabled. There is a problematic feature Mozilla Thunderbird uses and users have reported that disabling this feature helped them resolve their problem. Solution 2: Disabling Windows Search to search messages Kaspersky Internet Security: Home > Settings > Additional > Threats and Exclusions > Exclusions > Specify Trusted Applications > Add.ĪVG: Home > Settings > Components > Web Shield > Exceptions. It can often be found simply without much trouble but here are some quick instructions on how to find it in the most popular antivirus tools: The Exceptions or Exclusions setting is located in different spots with respect to different antivirus tools.Open the antivirus UI by double-clicking its icon at the system tray (right part of the taskbar at the bottom of the window) or by searching for it in the Start menu (Cortana).The process will differ from one antivirus to another but we have decided to list out the paths to this option in the most popular antivirus tools. Either way, the problem can be solved by adding the program’s executable to the exclusions list in your antivirus. If you are using a free antivirus, chances are that it may be blocking Mozilla Thunderbird from connecting to the Internet properly or from accessing certain files on your computer. Solution 1: Add Thunderbird to Exceptions in Your Antivirus

Thunderbird not receiving some emails