Tangential but it kinda irks me when people just put their initials when signing off on an email. It seems like unnecessary brevity in a world where you can type your name once in your emails signature line and never worry about typing it again.
I can quickly imagine several situations in which one might speak to a public facing individual but still like to say "I was told by {sales rep} that {statement} was the case" or "{Employee} in support assured me this would be resolved in {timeperiod}" or "I had an excellent conversation with {employee} and want to ensure they'll be getting any commission due to them because they really convinced me more than your website"
From: "John Doe" <support@domain.com>