[ExchangeList] Re: Reverse Lookup
- From: "Greg Mulholland" <greg@xxxxxxxxxxxxxx>
- To: <exchangelist@xxxxxxxxxxxxx>
- Date: Wed, 17 May 2006 17:46:52 +1000
i agree with John, the second option is stupid.
even with ptr lookups on incoming mail i still wouldn't get exchange to do
this, if i could ever possibly help it. But then again i have seen incoming
lookups cause more problems then not. If you have a good MTA then you can use
many other options which will help you alleviate the spam problem.
Greg Mulholland
________________________________
From: exchangelist-bounce@xxxxxxxxxxxxx on behalf of abrar ahmed papa
Sent: Wed 17/05/2006 4:42 PM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Re: Reverse Lookup
Hi,
Blocking incoming mail without a valid PTR record is possible using exchange.
Blocking outgoing mail without a valid PTR record is not possible using
exchange.
Regards
"John T (Lists)" <johnlist@xxxxxxxxxxxxxxxxxxx> wrote:
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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