Internet Draft Expires in Six Months Smtp Service Extension for Secure Smtp over Tls

Additional discussion of when a server should and should not advertise the STARTTLS extension (section 5) More discussion of the man-in-the-middle attacks (sections 5 and 7) Clarified section 5.1 on verifying certificates Added section 5.3, STARTTLS on the Submission Port Bug fix in the example in section 6 to indicate that the client needs to issue a new EHLO command, as already is described in section 5.2. Clarification of the second paragraph in section 7.