SNI support in `mail` context (fixed formatting)

[Chris Adams]

Once upon a time, Denis Sh. <denok at yandex.com> said:
>  Also, I wasn't able to find a reason why NGINX intentionally doesn't support passing thru the AUTH to the backend for SMTP, same as with IMAP/POP?

I looked at adding this, using ID for IMAP and XCLIENT for POP3 (what
Dovecot supports)... didn't get the time and don't need it now, but it
didn't look like it would be too difficult to implement.
-- 
Chris Adams <linux at cmadams.net>