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mail:common_blacklist_issues [2009-10-05 20:10:47]
ndcadmin Approved 		mail:common_blacklist_issues [2009-10-05 20:12:37]
ndcadmin Approved
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 A blacklist, or specifically a DNSBL (DNS-based Blackhole List) is a service operated by a party with the intent of restricting mail traffic from various domains to users who subscribe to that DNSBL. Criteria used to determine whether an IP address is to be listed is not standardized and is therefore up to the list maintainer to determine. The end result are lists that often use arbitrary or unreasonable criterion, sometimes even in conflict with those of other lists. Below we have compiled notes on various blacklists for your reference: A blacklist, or specifically a DNSBL (DNS-based Blackhole List) is a service operated by a party with the intent of restricting mail traffic from various domains to users who subscribe to that DNSBL. Criteria used to determine whether an IP address is to be listed is not standardized and is therefore up to the list maintainer to determine. The end result are lists that often use arbitrary or unreasonable criterion, sometimes even in conflict with those of other lists. Below we have compiled notes on various blacklists for your reference:
  
-  * **SpamCop**: Very accurate prediction algorithms, resulting in a near perfect rating when it comes to not blocking good mail, and an above average score for canning actual spam. Conservatively blocks CIDR ranges. (Ref: http://stats.dnsbl.com/spamcop.html)\\  +  * **SpamCop**: Very accurate prediction algorithms, resulting in a near perfect rating when it comes to not blocking good mail, and an above average score for canning actual spam. Conservatively blocks CIDR ranges. ((Ref: http://stats.dnsbl.com/spamcop.html))\\  
-  * **FiveTen**: Requires double opt-in list management for hosts. Blocks entire CIDR ranes (/24 and larger) quite liberally, resulting in on average twice the amount of good mail lost than actual spam blocked. (Ref: http://stats.dnsbl.com/fiveten.html)\\ +  * **FiveTen**: Requires double opt-in list management for hosts. Blocks entire CIDR ranes (/24 and larger) quite liberally, resulting in on average twice the amount of good mail lost than actual spam blocked. ((Ref: http://stats.dnsbl.com/fiveten.html))\\ 
   * **ivmSIP**: This includes ivmSIP/24, which is a CIDR-block list similar to that of FiveTen. According to list maintainer Rob McEwen: "only my subscribers use my data, and most of them either don't use ivmSIP/24, or use that list for scoring instead of blocking." Although ivmSIP is listed as a public DNSBL, as per the list maintainer, being listed here is going to have little impact on mail deliverability, unless the specific host you are attempting to deliver to uses this list to filter mail.   * **ivmSIP**: This includes ivmSIP/24, which is a CIDR-block list similar to that of FiveTen. According to list maintainer Rob McEwen: "only my subscribers use my data, and most of them either don't use ivmSIP/24, or use that list for scoring instead of blocking." Although ivmSIP is listed as a public DNSBL, as per the list maintainer, being listed here is going to have little impact on mail deliverability, unless the specific host you are attempting to deliver to uses this list to filter mail.