On 2/23/20 3:10 PM, Mark Hindley wrote: > You appear to be using the Thunderbird Autocrypt addon. This is adding a > duplicate To: header to your email. And that means the email is handled twice by > debbugs. aha! nice catch. autocrypt is indeed integrated in enigmail addon, so i could add per-recient rules to send unsigned to submit@b.d.o . thx, d.