On Fri, Feb 19, 1999 at 03:59:11PM -0500, Scott Schwartz wrote:
> Chris Johnson <[EMAIL PROTECTED]> writes:
> | On Fri, Feb 19, 1999 at 12:45:06PM -0500, Scott Schwartz wrote:
> | > The question arises, however, why those aol users don't just submit their
> | > mail to aol's smtp server? Presumably an aol user, just like any person on
> | > the internet, can submit a message to their local smtp server (for which they
> | > are authenticated) with a "From:" line that has one of your virtual domains
> | > in it (or indeed, any string they like). So why do aol users need to use you
> | > as their injection point?
> |
> | Try this with msn.com. If you're connected to their network and submit a
> | message to the local smtp server using a "From" address that isn't an msn.com
> | address, they'll *silently* discard your mail. They'll accept it, and without
> | warning deposit it into a bitbucket. (This was the case several months ago.
> | They may have wised up since, but I doubt it.) I've heard that other ISPs are
> | requiring that the envelope sender domain be one of their domains in order for
> | you to be able to relay, thus making them unusable as relays if you use a
> | different address. At one point (and this may have changed), ibm.net would give
> | you a "550: Unauthorized access" as soon as it saw a MAIL FROM with a
> | non-ibm.net address.
>
> Are you talking about envelope sender or From line? They don't need to
> be the same at all. For most purposes, getting the From line right
> should satisfy your virtual domain users.
I know they don't have to be the same, but I don't know of any non-Unix MUA
that knows that. You stick your e-mail address in the appropriate blank, and
the MUA creates the envelope sender and From line from it. I've never seen an
MUA that allowed you to specify a different envelope sender, and even if they
did allow such a thing I'd hate to have to explain that concept to someone.
Chris
