Mailing List Message #104156
From: Jeff Wark <>
Subject: Re: Blacklist by DNS name [(host name is unknown)]
Date: Thu, 02 May 2013 08:19:02 -0400
To: CommuniGate Pro Discussions <>
The latest documentation makes note of that feature here:

To get to that in the documentation, follow SysAdmin->Protection->Blacklisting Domains by Name

On 05/02/2013 07:48 AM, Jona Tallieu (T & T nv) wrote:


Does "(host name is unknown)" work in all versions of CGP?




On 02 May 2013, at 13:00, CommuniGate Pro Discussions <> wrote:

From: "Sergey" <>
Subject: RE: Blacklist by DNS name [(host name is unknown)]
Date: 2 May 2013 10:10:38 GMT+02:00

-----Original Message-----
From: CommuniGate Pro Discussions [] On
Behalf Of Lyle Giese
Sent: Thursday, May 02, 2013 8:40 AM
To: CommuniGate Pro Discussions
Subject: Re: Blacklist by DNS name [(host name is unknown)]

On 05/01/13 13:01, Jeff Wark wrote:
I was just wondering how many people used the setting where you reject 
hosts if they do not have a valid PTR record for the connecting IP 

Is it a standard, accepted policy at this time to behave that way or 
is it still something only AOL does?


AT&T, Comcast, Earthlink do it all the time.

Here in my country, it is the easiest way to get blacklisted if you don't
have a valid PTR record.

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