[SURBL-Discuss] Re: ANNOUNCE: Mail::SpamAssassin::SpamCopURI 0.18

Jeff Chan jeffc at surbl.org
Thu Jun 3 00:55:09 CEST 2004

On Wednesday, June 2, 2004, 11:39:02 PM, John Fawcett wrote:
> From: "Jeff Chan" 

>> As I understand it, SpamCopURI only handles "open" redirects where
>> the redirected-to site is visible in the original URI.
>> I'm not sure why/if the yahoo redirectors came out of the list.
>> Perhaps Eric Kolve can comment.
>> "Opaque" redirection sites, which encode or otherwise obscure the
>> destination URI, such as tinyurl.com, are not currently handled
>> in SpamCopURI (SA 2.63) or urirhsbl (SA 3.0), due to potential
>> resource issues.  Following such redirections would incur network
>> access, timeouts, etc. that would probably be unusable on a mail
>> system with significant message volume.

> SpamCopURI can resolve both types of redirectors. This is
> because (when enabled) it will go out and connect to the web
> server for the spamvertized site IF that site is listed as
> an open redirector. If spamcopuri gets a 3XX return code 
> from the web server, this will contain the redirected to url.
> (If the url is also an open redirector, then the operation is 
> repeated up to 4 times to pick up nested chains of 
> redirectors).

> There is nothing specific to this functionality which 
> would apply to yahoo and not to tinyurl. tinyurl is actually 
> already included in the sample rules file.

Thanks much for the clarification John.

Jeff C.

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