Jeff Chan wrote:
Hi All, SURBL is looking for statistics about what portion of unsolicited our lists are detecting (ideally in large mail flows). An overall number would be ideal, as in what fraction of total unsolicited messages are caught by any SURBL list. One possible way to measure this from SpamAssassin-processed messages would be to count the messages marked as spam that had 'SURBL' in their scores versus the ones that didn't have a SURBL rule hit. The ratio would be the spams with SURBL hits divided by total number of spams.
Another way would be to count the SURBL hits from an MTA milter, but to have the meaningful denominator, one would need a count of the total spams, which a simple SURBL-only milter would not be able to provide. Something else, or a more sophisticated milter would need to count the total spams in order to get the denominator.
Ideally the results would be after MTA blocking with a major sender blacklist like zen.spamhaus.org. Please let us know whether a sender blacklist is used in the MTA or not.
Postfix does not do any RBL checks, but does do greylisting and invalid hostname/helo blocking. For comparison purposes, here are my stats from this past weekend all URIBL tests I run (I've placed an * before the SURBL test results):
3 URIBL_RED 11 URIBL_GREY 227 URIBL_RHS_DOB 229 URIBL_SBL * 246 URIBL_SC_SURBL * 256 URIBL_AB_SURBL * 274 URIBL_WS_SURBL 294 URIBL_JMF_DOB * 733 URIBL_OB_SURBL * 1181 URIBL_JP_SURBL 1385 URIBL_JMF_BL 1674 URIBL_BLACK 2916 Messages Containing URI 3221 Total Messages Count
Bill