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Did you try to repair the Sent or Sent Items folder? Right click on Sent and/or Sent Items folder, then go to Properties and then click on Repair folder Sometimes mail gets "lost" to Thunderbird on moving, and becomes visible again when you repair folder.


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Opening messages with the -mail command line parameter is still possible with a current Thunderbird version (tested on Windows 10 with version 78.6.0, 32-bit). However, this requires a small change of the module MailNewsCommandLineHandler.jsm, because otherwise a getter-only error occurs when calling the -mail command. The error can be traced via the ...


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