Quoth Ken Hornstein: 'Are YOU, Russell Bell, going to be registering a key for sendmail' No. I have a client_id and client_token from gmail. I assume I can use them to authenticate *my* attempts to relay mail through their SMTP port (as myself, not as another user). I've also seen captures of negotiating this: it looks like mine but with OAuth authentication instead of what I use now. KH: 'it looks like it only implements OAuth 1.0 (the original XOAUTH mechanism), and GMail now supports OAuth 2.0.' And 1 still, from the output of a relay through it: '050 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH' I may misunderstand: I think mutt and all those other scripts call sendmail (or whatever resident SMTP server) to send messages. Am I wrong? russell bell