rdns bockking local ip? |
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erwinyu 
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Joined: 24 March 2005 Location: United States Status: Offline Points: 5 |
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 Topic: rdns bockking local ip?Posted: 02 April 2005 at 4:53pm |
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Correct me if I am wrong, does the Spamfilter check sender's Local IP and SMTP server's IP to see if it has Rdns setup? Currently, I have user getting their email rejected because their Local IP doesn't have rdns, but the smtp server has rdns. Is there a way to only check smtp server's rdns?
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Erwin |
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Desperado
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Joined: 27 January 2005 Location: United States Status: Offline Points: 1143 |
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Posted: 02 April 2005 at 10:30pm |
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Erwin, Please define "Local" user. Normally, SpamFilterISP is not used for the "Client" to mail through (allthough it can be set up that way). Having said that, If SpamFilter is configured to check for RDNS (a setting that is in the GUI) then the IP that connects to the SpamFilter Server must have a RDNS entry in the DNS server that is authoratative for that IP. There are many tools to check for RDNS but the simplest is to run nslookup from a command prompt. At the nslookup prompt type in the following command: set type=ptr Then if you type in the IP address in question, you can see the RDNS setting (if it exists). A typical session would look like the following: Microsoft Windows 2000 [Version 5.00.2195] C:\Documents and Settings\das52>nslookup > set type=ptr 33.197.181.66.in-addr.arpa name = bg1-33.adsl.mags.net Regards,
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The Desperado
Dan Seligmann. Work: http://www.mags.net Personal: http://www.desperado.com |
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Erwin
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Posted: 03 April 2005 at 3:58am |
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Dan, Our client is not using spamfilter to mail through. What happen is someone sends a email to our server. So out spamfilter picks up the sender's local ISP IP and SMTP server IP. Somehow, spamfilter is checking both IP to make sure it has rdns setup. Does that sound like smth that spamfilter will doing? I thought spamfilter only check for the server who tries to make connection to it. |
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Desperado
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Joined: 27 January 2005 Location: United States Status: Offline Points: 1143 |
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Posted: 03 April 2005 at 4:08am |
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SpamFilter should only see, and test for RDNS on the IP that actually makes the connection to it. Can you post a log entry? Dan |
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The Desperado
Dan Seligmann. Work: http://www.mags.net Personal: http://www.desperado.com |
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4104 |
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Posted: 03 April 2005 at 10:43am |
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Erwin,
SpamFilter only performs IP-based checks on the IP that is making the connection to SpamFilter. Any other IPs that are listed in the email headers are ignored. Depending on how the remote user sends the email, he can either connect with his PC directly to SpamFilter or it will be his mail server that will make the connection. It cannot be both, and SpamFilter will only check the IP making the connection. Should you see two checks the only way that can happen is that the remote client is sending *two* emails, one going directly to SpamFilter, the other going thru his SMTp server. In this case, in the SpamFilter's logs you'll see multiple connections arriving, not one. |
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