I have a Google Apps account, with 2-step verification, set up in Apple mail. Typically it works great for several weeks, or a month, but then the SMTP server has (Offline) next to it, and it will ...
When I try the command in terminal, an email is sent. I have checked there is no local SMTP is running, so what is the mechanism used by Apple behind the scene? echo "Hello" | mail -s "Test" ...