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BossBlock is a simple mod that allows you to filter out messages (spam) sent by other player's BossMods (CTRA_BossMods and oRA_BigWigs). Although I wholeheartedly agree that BossMods are nice and useful, I really HATE people that impose their mods upon others. Yes, I like to know when Ragnaros will submerge, but for the love of god stop spamming me about it!
So that's where BossBlock comes in. It simply supresses all those automatically generated messages in all the applicable channels (raid, tell, CTRA's overhead "raidsay" frame). oRA_RaidSay is not touched as this functionality is built into it.
Whatever your reason may be, this should help keep your raid chat a little less spammy.