IMAP SASL SASL AUTH EXTERNAL RFC4422 # Server-side AUTH EXTERNAL REPLY AUTHENTICATE + REPLY %b64[user]b64% A002 OK AUTHENTICATE completed From: me@somewhere To: fake@nowhere body -- yours sincerely # Client-side imap IMAP external authentication 'imap://user;AUTH=EXTERNAL@%HOSTIP:%IMAPPORT/%TESTNUMBER/;MAILINDEX=1' # Verify data after the test has been "shot" A001 CAPABILITY A002 AUTHENTICATE EXTERNAL %b64[user]b64% A003 SELECT %TESTNUMBER A004 FETCH 1 BODY[] A005 LOGOUT