"A unique identity matching the From address was not found. The message will be sent using the current From field and settings from identity <<matched identity>>".

Hi there, I use Thunderbird 91.9.1 (64-bit) and have multiple identities (let's say a@foo.com, b@foo.com, c@bar.com) set up and also use the "Reply from this identity when delivery headers match" option. Most of the time this works great but when answering to mailing lists (where none of my addresses is in the TO field) there is a bug. Let's assume the email was sent to the mailing list is importantlist@foo.com without any other recipients. When I press Reply or Reply-All, Thunderbird sets the FROM field to the mailing list (i.e. importantlist@foo.com), which unfortunately doesn't make sense. It displays the error message "A unique identity matching the From address was not found. The message will be sent using the current From field and settings from identity <<matched identity>>". Here, Thunderbird actually finds the correct identity as setup via "Reply from this identity when delivery headers match" as it is displayed instead of <<matched identity>> in the error message. I have another account set up with only a single identity and here it always uses this address to answer to whatever email. I can manually change the from address to the correct one, but that's pretty annoying. Moreover, I then have to manually add the mailing list to the TO field as Thunderbird only replies to the sender. What I'd expect: As Thunderbird already finds the correct identity, it should use this. If it can't match anything, it should use the default identity. This would resemble the behavior of the single identity case in my opinion. I'm happy to provide more details if you need something. Thans in adavance! Cheers, Eicke