On 2/6/07, Roger E. Rustad, Jr. <[email protected]> wrote:
> It seems that you have answered your own question, because everyone uses
550's.
> Were you looking for justification that sending back a 550 error response was
> what you were wanting to do? What are you looking for?
I assume that 550 replies was what I needed, but I was just wanted
some assurance.
> I would install a mail proxy box, running postfix, have it do all the nice and
> nasty stuff like screening out bad IP's, greylisting, tar-pitting, SPF,
> anti-virus scanning, invalid-user/550 responses, whatever... and then if the
> customer really wants to have an Exchange server, then the postfix machine can
> just nicely relay only the good messages to the internal Exchange server.
Postfix is so nice, as compared to Sendmail or even Qmail.
I'm getting there. I haven't offered to take on this project for fear
of making my users dependent on a box that I'm not 100% confidant of
administering.
You could always do a hosted solution.
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