Spam Filter ISP Forums : DNS lookups https://www.logsat.com/spamfilter/forums/ Mon, 17 Aug 2026 03:28:36 +0000 Tue, 06 May 2003 16:01:00 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.04 360 https://www.logsat.com/spamfilter/forums/RSS_post_feed.asp?TID=408 <![CDATA[Spam Filter ISP Forums]]> https://www.logsat.com/spamfilter/forums/forum_images/web_wiz_forums.png https://www.logsat.com/spamfilter/forums/ <![CDATA[DNS lookups : Wayne, Currently there is one...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=408&PID=411&title=dns-lookups#411 Author: LogSat
Subject: 408
Posted: 06 May 2003 at 4:01pm

Wayne,

Currently there is one RBL lookup per incoming connection. All other tests are performed before the DNS lookup to avoid it as much as possible. Caching the lookup result to avoid repeating it is in the works and should be ready fairly soon. In any case, in theory even with extra lookups you should still be saving bandwidth if the email gets rejected.

Roberto Franceschetti
LogSat Software

]]> Tue, 06 May 2003 16:01:00 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=408&PID=411&title=dns-lookups#411 <![CDATA[DNS lookups : Just a quick question, if say...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=408&PID=408&title=dns-lookups#408 Author: Guests
Subject: 408
Posted: 06 May 2003 at 1:52pm

Just a quick question, if say 500 spam emails hit my server, and they all come from the same open relay will there be a lookup to the RBL for each email or will 1 lookup deal with all of them?

We are trying to get a good feel for the increase in network (WAN) traffic we will see as a result of the reverse lookups for the RBL checks. Any input would be appreciated.

 

Wayne

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