World is pretty unmanageable with repeated (and sometimes unwanted) messages. The SpamThrottle addon helps by eliminating duplicated messages, with a configurable timeout. It also has an unlimited user-defined keyword block list, and ability to block seeing messages from an unlimited list of playernames. https://github.com/Orukxu/SpamThrottle.git
To install: Go to GitHub at the URL above, click on the "Download ZIP" button, unpack the zip file, and then place the SpamThrottle directory in your ../Interface/Addons directory under your WoW installation folder.
Type /st or /spamthrottle to bring up the config menu. Any questions feel free to pst Mopar (alliance) in game.
Bump this thread if you try it and find it useful. Feel free to include it any addon packs or other sites you choose to.
Latest version: 1.6 *new* as of September 28, 2015. Recent modifications:
- Added in channel whitelist
- Made dup filtering and /y filtering optional (see config menu)
- Added in more gold seller sites that have popped up recently to default keyword list
- Fixed some bugs