spamming definition?

[udan]

Dear udan,

You have received an infraction at WJunction.

Reason: Spamming members PM inbox
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STOP spamming members PM inbox
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This infraction is worth 3 point(s) and may result in restricted access until it expires. Serious infractions will never expire.

All the best,
WJunction

I found this message in my inbox today. My total message count being 14.

 

[Royal King]

You must be PMing everyone trying to spam something. How do we know about that?
PM the guy who gave you this infraction.