How to sign your emails

I enjoyed this article, here is an excerpt:

"If you have been writing to someone 'Best' this and 'Best' that, and
you get an e-mail that is a little colder, a little hostile, and they
sign 'Sincerely,' that does mean things aren't so good," Schwalbe says.
" 'Sincerely' is the one that says, 'There's a problem here.' "

And, one may well wonder, does "Cordially" ever mean anything other than "My hostility is only thinly veiled"?

And when, e-mail-wise, is it too early for "Love"? Does "Fondly"
ever belong in business? Is "Cheers" too mock-Brit? Too alcoholic?

Fondly,

Tyler