I'm trying to read local mail from /var/mail on macOS. I can put mail there (via postfix I assume) using something like `mail -s "Test mail" username. I can also read it using `mail`. I have read that in theory, Thunderbird should be able to read this mail too. For example, https://askubuntu.com/questions/301988/using-movemail-with-thunderbird-on-ubuntu The above link suggests that if I go to Tools->Account Settings, then Account Actions->Add other account, I should find an option to add a 'Unix Mailspool (Movemail)' account. However, when I go there on mac, I only have the option to add a Newsgroup account. (See attached screenshot) Is there a way to enable this feature on mac? I asked a similar question on this closed bug, but was told to come here instead: https://bugzilla.mozilla.org/show_bug.cgi?id=365879#c6