[ietf-dkim] Issue with threats-02: 1.1 Terminology and Model - SMTP != POP

[Hector Santos]

| 1.  Terminology and Model
|
| ...
|
|   DKIM operates entirely on the content (body and selected header
|   fields) of the message, as defined in RFC 2822 [RFC2822].  The
|   transmission of messages via SMTP, defined in RFC 2821 [RFC2821], and
|   such elements as the envelope-from and envelope-to addresses and the
|   HELO domain are not relevant to DKIM verification.  This is an
|   intentional decision made to allow verification of messages via
|   protocols other than SMTP, such as POP [RFC1939] and IMAP [RFC3501]
|   which an MUA acting as a verifier might use.

The prior sentence talks about transmission such as SMTP. POP is not SMTP.

I suggest the change to:

    This is an intentional decision made to allow verification
    of messages via other mail submission protocols protocols other than
SMTP, such as POP [RFC1939] and IMAP [RFC3501]
|   which an MUA acting as a verifier might use.