It's suppose to only happen when its:

A) Vulgar Language
B) Contains a RMT "phrase"
C) Just super long in general (?)[Like, RMT long? I dunno.]

If they were to remove it, then you'd probably make another thread about the influx of RMT messages you've gotten in the past hour.

Isn't it just simply better to use party chat to RP, anyways?