Resolving for URLsInMAPS |
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yapadu 
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Joined: 12 May 2005 Status: Offline Points: 297 |
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 Topic: Resolving for URLsInMAPSPosted: 23 November 2009 at 9:01am |
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I see this type of thing in my logs often (hundreds and hundreds of times a day).
Resolving for URLsInMAPS: www..facebook.com Resolving for URLsInMAPS: www..bpnews.net Resolving for URLsInMAPS: www.= Resolving for URLsInMAPS: www.carsguide.com= Resolving for URLsInMAPS: www.carsguide.c= Resolving for URLsInMAPS: emai= Resolving for URLsInMAPS: email.enew= Resolving for URLsInMAPS: = Resolving for URLsInMAPS: email.enewslt= Obviously they are not valid URL's, so they are usually followed by an error like this: Error occurred during URLsInMAPS: DNS Server Reports Query Name Error Of course the system does also find URL's that are possible, but it seems odd that it picks out these and tries to check them. |
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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: 23 November 2009 at 10:51pm |
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yapadu,
SpamFilter picks up various href tags embedded in HTML emails, both linking to URLs and to images. Sometimes the hrefs are encoded, other times they are simply incorrect. SpamFilter does not currently perform additional URL validation before submitting them for DNS lookups, which is why you will see these (innocuous) errors in the logs. Performing additional validation before actually checking a URL's domain in DNS would indeed eliminate most of those errors, however validating each URL would add (likely minimal) overhead to the entire process. As most of the times the URLs are actually valid, it was a judgement call on our part as so whether or not to validate URLs that would likely be valid to begin with. We opted not to, but this may change in the future if we see this to become a problem.
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