smtpmail, starttls authentication

[Phillip Lord]

I'm trying to get smtpmail to work with starttls. I think that I have
some of it working, but I am a bit stuck on the authentication. 


I have the following setup with appropriate values for set for all the
"myserver" bits...

(setq smtpmail-smtp-server "myserver")
(setq send-mail-function 'smtpmail-send-it)


(setq smtpmail-auth-credentials  ; or use ~/.authinfo
      '(("myserver" 993 "myusername" "mypassword")))
(setq smtpmail-starttls-credentials
      '(("smtpauth.ncl.ac.uk" 993 "" "" )))


I get this response. 

220 myserver ESMTP Sendmail 8.12.11/8.12.10; Mon, 21 Aug 2006 12:13:30 +0100
EHLO MACHINE
250-myserver Hello machine, pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-STARTTLS
250-DELIVERBY
250 HELP
MAIL FROM:<phillip.lord@newcastle.ac.uk> SIZE=626
530 5.7.0 Authentication required
QUIT
221 2.0.0 myserver closing connection


I am sure that the reason is because the smtpmail-starttls-credentials
variable doesn't have anything set for the key and certificate. 

But I have no idea where I am supposed to set for these, nor where I
am get the appropriate certificates from. 

I'd be grateful for any pointers -- the IMAP over SSL worked very
well, just requiring the addition of ":stream 'ssl" to my
mail-sources, but sending mail is giving me a headache. 

Cheers

Phil