Hello,
Looking at the multi.surbl.org zone yesterday, I noticed approximately 373 subdomains in the list.
Here are a few examples:
www.fcudwedenagov.com www.freecat.biz www.hesvlabean.com www.hterrani.com ms7.pptel.net msn.41m.com mwetillf.iscool.net mx.servebbs.net mx2.dynu.net www.yelvertonstores.co.uk
Looking at http://www.surbl.org/implementation.html item 2, do these subdomains belong in the list?
"Extract base (registrar) domains from those URIs. This includes removing any and all leading host names, subdomains, www., randomized subdomains, etc. In order to determine the base domain it may be necessary to use a table of country code TLDs (ccTLDs) such as this partially-complete one SURBL uses. (Note that this file is only rarely updated. Please don't download it frequently.) For example, any domain found in the two level ccTLD list should have a three-level domain name extracted (like foo.co.uk) for matching against a SURBL. Domains not specifically on the two level ccTLD list (such as foo.com or foo.fr) should be checked at two levels."
I believe SpamAssassin's URIDNSBL reduces the URIs to the base domain (e.g. example.com, example.co.uk), so if it encountered "www.freecat.biz," for example, it would lookup freecat.biz, which is not in the list.
Besides URIDNSBL, are there other URI lookup implementations for which it makes sense to include subdomains?
Thanks!
Brandon