[Mailman-Developers] Re: Theoretical way to minimize IO load with MTA supported VERP

[tneff@bigfoot.com]

"Jay R. Ashworth" <jra@baylink.com> wrote:
> I don't see that there *is* any theoretical way to *keep* loads down
> with VERP, by it's very nature.
...
> If I'm sending 100 copies to @aol.com, without VERP, I send the message
> once.
>
> With VERP, I have to send it 100 times.

If one was willing to extend SMTP again, it would be theoretically possible 
to send one copy of a message to aol.com for 100 recipients with a form of 
VERP, using an extended syntax like

	MAIL FROM:mylist-owner@mydomain.com
	250 mylist-owner@mydomain.com... Sender ok
	RCPT TO:johnsmith@aol.com EPFX:johnsmith-aol.com-
	250 johnsmith@aol.com... Recipient ok
	RCPT TO:joerandom@aol.com EPFX:joerandom-aol.com-
	250 joerandom@aol.com... Recipient ok
	DATA

and the receiving MTA would prepend the EPFX value to the envelope sender 
for each recipient.