Originally posted by Maziel Guild Invites
Party Invites (unless from friend or guild)
Trades
Arena Invites
Guild Charter Signature requests
Trades can be blocked via an option in Interface Options -> Controls -> Block Trades
I can probably add the ability to block Arena Invites, but I don't plan on blocking party invites, that's just not something I find particularly useful.
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"The future isn't what it used to be." - G'Kar