macOS Mail won't clear out the outgoing SMTP server list
PLEASE NOTE three symptoms in one that makes this extremely buggy:
- going to "Edit SMTP server list..." and then deleting the items from the list window DOES NOT WORK
- when I try to add new SMTP servers, my new server does not "stick" and is not choosable (and has no effect)
- when I edit an existing one, any changes I make appear to stick only until I quit & relaunch Mail, after which Mail appears to REVERT to the old settings for my SMTP server list.
this has always been buggy (over the last 20 years), but only under Catalina 10.15.7 is this now no longer editable for me