User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.2 Safari/605.1.15

Steps to reproduce:

I was trying to send an email to a recipient that uses subadressing (i.e. name+subaddress@google.com or name-subaddress@their own host). Their GPG Key has 2 identities, one is "Firstname Lastname" and one is "Firstname Lastname (name@google.com). The recipient has asked me to use their key with name+subaddress@google.com even though it is not listed in the key. They do not want me to send to non-subaddressed address.

Actual results:

I was not able to make a manual selection of the encryption key as in enigmail. Since no key for this custom address+subaddress exists, I was not able to encrypt the mail.

Expected results:

I should at some point be able to select a key manually if no key is found

This is how it worked in Enigmail: https://www.enigmail.net/index.php/en/user-manual/signature-and-encryption#Encrypting_a_message

It's pretty shitty that you deprecate Enigmail and didn't even replicate all the useful features. This bug literally makes the new Thunderbird integration unusable for many people.

At least the severity should be set to "high" since it breaks sending to "secret" aliases.

(In reply to Luca Steinke from comment #1)

It's pretty shitty

I'd prefer more respectful language.

that you deprecate Enigmail and didn't even replicate all the useful features.

Thunderbird didn't deprecate Enigmail. It became impossible to use it further, and we worked hard to provide an initial replacement. You might want to read blog.thunderbird.net for background.

This bug literally makes the new Thunderbird integration unusable for many people.

An initial solution is currently being worked on in bug 1644085, which requires the use of a configuration file that defines alias rules. It allows the user to override which encryption key (or set of keys) is used for a recipient by email address.

Same here: I'm unable to reply to an encrypted mail right now, because the key is associated with multiple addresses, but Thunderbird only matches the first one. Currently with version 78.10.1 - by me the status is very confirmed. Why such a simple issue still exist? Very disturbing issue - practically makes GPG unusable in Thunderbird. It is very common, that people have more than one address in GPG-key.

https://wiki.mozilla.org/Thunderbird:OpenPGP:Aliases no solution?

Please use the recently added feature that Arvidt mentioned in comment 5 to solve your requirement.