RE: Passing authentication information via SMTP

> One of the concerns raised with LMAP proposals is the fact that they 
> overload the MAIL FROM command.
Isn't that the intent?

I understand overloading a DNS record type - giving more meaning to a
record type than originally intended.

I'm not as clear on "overloading" a SMTP command, especially this one as
MAIL FROM is supposed to tell us who the mail is from and we're only
verifying that - at least as far as the domain part for most.