Can you add a header to an email in Thunderbird?
I'm using a mailing service that requires me to add an additional header to an email: Header - X-PM-MESSAGE-STREAM: {stream-id}
Is it possible to do this in Thunderbird and if so, how?
Opaite Mbohovái (2)
Found the answer, yes you can :) See: https://www.lifewire.com/arbitrary-custom-heading-email-thunderbird-1173089
Moambuepyre
https://www.lifewire.com/arbitrary-custom-heading-email-thunderbird-1173089
In TB 78, Config. editor is under Options/General/Indexing.