So you have installed Mutt in Mac OS X Yosemite, because you know  “All mail clients suck. This one just sucks less“. You use GMail, because you like it, and you configured it with Mutt (of course). You have just finished to compose your mail, and when you hit ‘*y’ *to send it, you get the following message:

“No Authenticators Available”

What the f….????

Add the following to your .muttrc:

set <a href="http://www.mutt.org/doc/devel/manual.html#smtp-authenticators">smtp_authenticators</a> = 'gssapi:login'

Then, you are good to go.

 

Source: https://github.com/Homebrew/homebrew/issues/33419