The numbers below are averages per day for our primary MX over the past 30 days, with an average of 861,344 emails per day.
mime_header_checks rejects 11% of emails
SecuritySage_rhsbl5 rejects 14% of emails
header_checks rejects 23% of emails
body_checks rejects 18% of emails
other_rbls reject 17% of emails
Of the remaining 17% of emails that get processed by the system, SpamAssassin catches 6%
Of the remaining 11% of emails, there are very few spams that slip by.
Also note that the checks files each have a SPAM-ID, so if there is something wrongfully rejected, and someone complains about it, we tend to update the filters quite quickly.
If you have any questions about how we do things, feel free to contact me off-list.
Regards, Jeff
On Thursday, October 9, 2003, at 02:00 PM, Dan Wilder wrote:
Anybody here have any experience with the MTA-level checks found at
http://www.securitysage.com/files.html
??
This stuff is Postfix-specific, and includes a bunch of patterns for various checks which purport to catch a lot of spam. The files may be updated daily.
While it's true you're using incoming network bandwidth accepting some part of the email, it's possible that you save some CPU bandwidth, as the scanning is apt to be relatively lightweight. Also, Postfix is pretty good at load-shedding, which should limit CPU bandwidth absorbed.
If anybody's tried them, I'm interested in knowning whether they're effective, to what extent they're prone to false postives and how much, if at all, they lower the burden of spam which is subsequently detected by SA.
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