[Mimedefang] Verizon and greylisting
Jeff Rife
mimedefang at nabs.net
Sat Dec 23 10:13:32 EST 2006
On 22 Dec 2006 at 21:40, Joseph Brennan wrote:
>
> Jeff Rife <mimedefang at nabs.net> wrote:
>
> > if ($Sender eq '<>') # don't greylist here for DSN or callback
> > {
> > if ($#Recipients > 1) # Can't have more than one with null sender
>
>
> This is false. Consider the case of a mailing list with more than
> one list owner.
So, how do you put the two list owners into the "MAIL FROM:" SMTP
command? It's the argument for this command that turns into the
recipient of a DSN (eventually, because this is inserted into the
"Return-Path" header by receiving MTAs that accept the e-mail).
So, it's very possible that your list has more than one owner, but no
external MTA should be sending a DSN to multiple recipients...the
single recipient would be something like "list-owner at yourdomain.tld".
That may then get expanded into two or more addresses locally, but you
would never greylist that sort of e-mail, since it is originating at
127.0.0.1.
Yes, you could have a "Errors-To" header with more than one address,
but doing that and then accepting mail from "<>" to multiple users is
just asking for joe-jobs.
--
Jeff Rife | "There was a guy that was killed just like this
| over in Jersey."
| "Yeah, but I figure, 'What the hell,
| that's Jersey.'"
| -- "Highlander"
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