How to remove the default mail client check in Thunderbird

Mozilla Thunderbird provides option to turn off the default mail client check. This can be done using the Thunderbird Options.

Click The Tools menu –> select Options from the list of available menus.

In the Options window, click the Advanced section and navigate to System Integration section.


To disable the default mail client check, un tick the checkbox with label as Always check to see if Thunderbird is the default mail client on startup. Click the OK button to save the changes.

In Category: Technical

Ravi Shankar

A Software developer and blogger who is always looking to provide technical help to the wider community.

Show 8 Comments
  • mm October 17, 2011, 10:21 am


  • Ghostwolf October 18, 2013, 3:59 am

    Nice thought; doesn’t work.

    At Thunderbird > Tools > Options > Advanced: neither of the System Integration boxes is ticked.

    Using Windows 7 Professional, Control Panel > Default Programs > Set Default Programs > Thunderbird: “This program has 0 out of 4 defaults”, which – I’m assuming – means it’s not set as the default.

    Yet I still get the system integration prompt each time I open Thunderbird.

  • Its Me November 13, 2013, 12:12 am

    I second Mr. Ghostwolf
    (Is that inspired by ThreeHowlingWolf by any chance)

    Using Windows 8.1 and Thunderbird 24.1.0
    On each start it asks again. I also tried starting as Administrator in the hope that it would be able to store the option I choose (skip integration)
    All the flags are unticked.

  • Dave December 28, 2013, 5:04 am

    To get rid of the System Integration prompt, uncheck all options (Email, etc.) and then click Set as Default. Close and then reopen Thunderbird. The prompt should be gone.

  • ShaunyK January 15, 2014, 1:46 pm

    Thanks Dave, that works! Very unintuitive though!

  • YZ October 30, 2014, 8:21 pm

    Yeap, Dave’s solution is indeed the only working solution!!!

  • marco November 20, 2014, 12:50 pm

    Which actually means that if you do not set Thunderbird as your default Email they will keep pesting you forever. Or until you do.

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