[ExchangeList] Re: Reverse Lookup

  • From: "John T \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 16 May 2006 23:16:41 -0700

http://www.msexchange.org
-------------------------------------------------------Andrew, you are mixing 
things up again. 

Doing a PTR lookup on the connecting server on an incoming message is a
valid test as part of an anti-spam effort.

Doing a PTR lookup on the receiving server on an outgoing message is
worthless as part of an anti-spam effort to keep spam from coming in.

John T
eServices For You

"Seek, and ye shall find!"

> -----Original Message-----
> From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx]
> On Behalf Of Andrew English
> Sent: Tuesday, May 16, 2006 6:46 PM
> To: exchangelist@xxxxxxxxxxxxx
> Subject: [ExchangeList] Re: Reverse Lookup
> 
> http://www.msexchange.org
> -------------------------------------------------------I don't know what
with your emails
> John but they all start after the
> ---- line as suppose to under it. Anyhow regarding ethics tell that to
> the hordes of companies that only accept and send email if they can
> reverse look up your IP.
> 
> Andrew :)
> 
> -----Original Message-----
> From: exchangelist-bounce@xxxxxxxxxxxxx
> [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of John T (Lists)
> Sent: Tuesday, May 16, 2006 7:16 PM
> To: exchangelist@xxxxxxxxxxxxx
> Subject: [ExchangeList] Re: Reverse Lookup
> 
> http://www.msexchange.org
> -------------------------------------------------------So if the
> recipient e-mail server does not have a valid PRT record, you do
> not want to deliver the message but delete it? Other than the fact there
> is
> no valid reason for do that, it would break ethics if not laws.
> 
> John T
> eServices For You
> 
> "Seek, and ye shall find!"
> 
> > -----Original Message-----
> > From: exchangelist-bounce@xxxxxxxxxxxxx
> [mailto:exchangelist-bounce@xxxxxxxxxxxxx]
> > On Behalf Of Andrew English
> > Sent: Tuesday, May 16, 2006 3:52 PM
> > To: exchangelist@xxxxxxxxxxxxx
> > Subject: [ExchangeList] Re: Reverse Lookup
> >
> > http://www.msexchange.org
> > -------------------------------------------------------
> > How do I get Exchange to do a reverse lookup of the IP address it's
> > sending an email to before sending it to check if it's valid or not,
> and
> > if it's not valid to drop the email all together?
> >
> > Thanks
> > Andrew
> >
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> 
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