[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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