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Quoting Henrik K <firstname.lastname@example.org>:
> On Tue, Apr 17, 2012 at 11:04:43AM +0100, Sam Jones wrote:
>> Just imagine whitelisting a shared, spammy server because a domain is
>> hosted on it. Naturally it will probably come through greylisting in the
>> end anyway, but I'd not go out of my way to make it easy on them!
> A shared server or similar could be sending both ham and spam. I'm sure you
> would rather receive the ham instead of rejecting it straight away. After
> all, you do have _more_ defence layers than just the simple rbl/greylisting
> at MTA stage which we are talking about bypassing here?
> Someone commented about autoresponders.. every good admin should block them
> to suspicious mails anyway. I sure have lots of processing on my relay which
> prevents autoreplying to anything even smelling like spam. Stupid
Why bother whitelisting any ip address? I have my system flag the
outgoing and incoming email address.
If the from address and the to address, are reversed from how the
email went from me to them, AND it passes other checks, like spf, THEN
that email can come directly in.
This isn't affected by shared servers, whitelisting incorrect ip
addresses, and other issues.
I also run most of my domains with different incoming and outgoing ip
addresses for email.