If you have a problem with someone messaging you, report & ignore.
This list might not be entirely up to date (I've edited a few):
Admin
Theymos
Stefan Thomas
BadBear
Global Mods
SaltySpitoon
Maged
Raoul Duke aka Psy
malevolent
Staff
PsychoticBoy
Benson Samuel
Cyrus
aantonop
ealfskillz
wangbus
nanaimogold
HostFat
BitLex
LZ
jgarzik
davout
hazek
grue
gmaxwell
MiningBuddy
majamalu
tysat
dserrano5
phantastisch
D.H.
ckolivas
ThiagoCMC
mprep
vgo
Like I mentioned this list probably isn't up to date, but you can verify it yourself via the member list.