Another ambiguous SPF Rule confuses admin |
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pcmatt 
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Joined: 15 February 2005 Location: United States Status: Offline Points: 116 |
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 Topic: Another ambiguous SPF Rule confuses adminPosted: 18 September 2006 at 10:16pm |
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Thought it was a bug in SpamFilter but really a bug in SPF documentation. Identifiers are not really clear in some cases. Example: TXT Record - "v=spf1 a -all" the identifyer above "a" does not refer to all host records as it reads literally in the SPF docs, but only refers to the host record for the domain itself. This was originally mis identified as a bug in SpamFilter.
Edited by pcmatt |
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-Matt R
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4106 |
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Posted: 19 September 2006 at 8:34am |
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Matt,
Actually SpamFilter's behavior is correct. You can verify this directly from the official openspf site: http://www.openspf.org/why.html?sender=joe%40125percent.com& amp;ip=65.166.65.106&formwasused=1&debug=0 The email should indeed be rejected when originating from 65.166.65.106. The nslookup results for an "A" search in fact only show the results for the .108: > set type=a > 125percent.com Server: ns1.netwide.net Address: 209.26.140.2 Non-authoritative answer: Name: 125percent.com Address: 65.166.65.108 > |
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pcmatt
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Joined: 15 February 2005 Location: United States Status: Offline Points: 116 |
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Posted: 19 September 2006 at 8:57am |
I would use their test if it was not wrong too. We should have a program that is correct, not modeled after an incorrect example.The a mechanism clearly documents that when only the a specifier is used ALL the A records for domain are tested. If the client IP is found among them, this mechanism matches. -MJR The
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-Matt R
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mikek
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Joined: 22 February 2005 Location: Switzerland Status: Offline Points: 133 |
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Posted: 19 September 2006 at 9:29am |
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that's the A entries for <domain>, not <host.domain>...
if you have two A records for 125percent.com, they will be checked, but not any host A records. your dns zone probably looks something like this (here you see the problem, there is no way to list the host A records since the domain was - correctly - set up to deny listing records): 125percent.com A 65.166.65.108 mail.125percent.com A 65.166.65.108 smtp.125percent.com A 65.166.65.106 if you would add 125percent.com A 65.166.65.106 the second address would be output by an nslookup 125percent.com and therefore checked by the SPF A mechanism as well. Edited by mikek |
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pcmatt
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Joined: 15 February 2005 Location: United States Status: Offline Points: 116 |
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Posted: 19 September 2006 at 10:50am |
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Roberto, You are correct. The documentation on SPF is unclear and has succesfully confused domain admins and myself. |
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-Matt R
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4106 |
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Posted: 19 September 2006 at 11:54am |
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Don't worry Matt... remember all the times when WE were confused with SPF and had it wrong and YOU pointed us in the right direction
 ?
Edited by LogSat |
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