RE: RDNS: Reject on fail l
- From: "Jason Merrique" <j.merrique@xxxxxxxxxxxxxxx>
- To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
- Date: Fri, 7 May 2004 10:48:38 +0100
My initial question was "I'd like to......is it possible?"
Fair point though about the zombie PTR records. It hadn't crossed my
mind that most DSL users would pass an RDNS test....
Cheers,
Jason
________________________________
From: John Tolmachoff (Lists)
[mailto:johnlist@xxxxxxxxxxxxxxxxxxx]
Sent: 06 May 2004 19:36
To: [ExchangeList]
Subject: [exchangelist] RE: RDNS: Reject on fail l
http://www.MSExchange.org/ <http://www.MSExchange.org/>
You said pretty much. What about the new client you just got and
the boss is waiting for an e-mail from them, but they are a small shop
and do not have their server setup completely right, and your boss is
wondering why he has not gotten the e-mail from them yet, and calls
them, and they say they sent it but it bounced back as undeliverable.
Oh, BTW, 90% of the spam being sent through zombies does indeed
have a PTR record, because the ISP has a generic on there.
So, in conclusion, testing for a PTR record is not worthy of
blocking the receipt, however it is good in a weighted system.
John Tolmachoff
Engineer/Consultant/Owner
eServices For You
-----Original Message-----
From: Jason Merrique [mailto:j.merrique@xxxxxxxxxxxxxxx]
Sent: Thursday, May 06, 2004 11:29 AM
To: [ExchangeList]
Subject: [exchangelist] RE: RDNS: Reject on fail l
http://www.MSExchange.org/
Hi John,
Not doing something because a company we hate does it, isn't a
particularly good reason. I've noticed that most of the spam we receive
fails an RDNS lookup, and pretty much all the legitimate email we
receive passes.
Is it possible?
Cheers,
Jason
________________________________
From: John Tolmachoff (Lists)
[mailto:johnlist@xxxxxxxxxxxxxxxxxxx]
Sent: 06 May 2004 16:26
To: [ExchangeList]
Subject: [exchangelist] RE: RDNS: Reject on fail l
http://www.MSExchange.org/
Not practical or wise to do that.
AOL, who acts like a God, does this. All the rest of us
mail server admins hate AOL.
If everyone played by the books, yes, that would be
fine.
John Tolmachoff
Engineer/Consultant/Owner
eServices For You
-----Original Message-----
From: Jason Merrique [mailto:j.merrique@xxxxxxxxxxxxxxx]
Sent: Thursday, May 06, 2004 5:07 AM
To: [ExchangeList]
Subject: [exchangelist] RDNS: Reject on fai l
http://www.MSExchange.org/
Hi All,
I'd like to configure our mail server to reject email
that fails an RDNS check. We're running Exchange 2003. Is this possible
without a third party program? I've found the option to "Perform reverse
DNS lookup on incoming messages", but not the one to reject messages
that fail it.
Any ideas?
Cheers,
Jason
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