Hi,
section 2.1 of the submission spec defines the three MSA, MTA, MUA
acronyms. These definitions are often expanded for explaining the
corresponding concepts to end users, e.g. on Wikipedia. IME, there is
still confusion. For example, users tend to think that an MSA or an
MTA may be included in a MUA; I'm not sure why.
For example, I would change
A process that conforms to [SMTP-MTA]. An MTA acts as an SMTP server
to accept messages from an MSA or another MTA, and either delivers
them or acts as an SMTP client to relay them to another MTA.
to
A process that conforms to [SMTP-MTA]. An MTA is a fully-capable
SMTP server. It accepts messages from an MSA, another MTA, or a MUA
not conforming to these specifications, and either delivers them or
acts as an SMTP client to relay them to another MTA.
Also, is the term "split-MUA" still common? What is the term for
clients that read from $MAIL? (RFC 1725 removed that digression.)
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