Draft message disappears when changing sender identity in Thunderbird

MitchPerso — Wed, 25 Mar 2026 11:51:10 GMT

Hello,

I’m experiencing an issue in Mozilla Thunderbird when composing an email.

When I start writing a message and then change the sender identity (the “From” address), the entire content of the message is immediately erased. The draft cannot be recovered, even if I switch back to the original sender address or try using undo (Ctrl + Z).

This results in a complete loss of the message content, which is quite problematic.

Steps to reproduce:

Start composing a new email
Write some text in the message body
Change the sender identity (“From” field)
The message content disappears instantly

Expected behavior:
The message content should remain intact when changing the sender identity.

Actual behavior:
The message content is erased and cannot be recovered.

Environment:

OS: Windows 11
Thunderbird version: latest version 140.9.0 esr 64bits

Could you please confirm if this is a known issue or a bug, and whether there is a workaround?

Thank you.
Mitch

Re: Draft message disappears when changing sender identity in Thunderbird

siffemcon — Thu, 26 Mar 2026 01:24:44 GMT

I can't reproduce that behavior. You could file a bug at https://bugzilla.mozilla.org/enter_bug.cgi/ for that. If you do, please post the link to it here.

topic Draft message disappears when changing sender identity in Thunderbird in Discussions

Draft message disappears when changing sender identity in Thunderbird

Re: Draft message disappears when changing sender identity in Thunderbird