![](https://startrek.website/pictrs/image/5ebc24f2-8d48-4a25-89ec-f0c1708f4e4d.png)
![](https://programming.dev/pictrs/image/170721ad-9010-470f-a4a4-ead95f51f13b.png)
I’ll note that a number of groups and forums send mailing list like emails (google groups, django dev being a big one) and that notifications can be threaded from places like Github with the right client.
Thunderbird has good threading.
Roundcube webmail is also capable here. Though when I have had it working it didn’t include sent messages… which is not great in my mind.
The deb version is a pointer to the snap in their repos. Nothings being replaced, it no longer exists. The deb version of Firefox in Ubuntu repos is a wrapper that installs snap and has no binaries in it. Has been for 3 years or so.