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.