So much this. I rolled a DK on a server just to hang out with a friend who I've known forever but only just put on Real ID this weekend, and I started getting bombed with automated guild invites. Thankfully my friend pointed me at her husband's little tiny guild, which was formed, hilariously enough, so they could avoid the auto invite beasts on alts. That kind of bombing of invites is annoying.

There is an option under interface/controls to block guild invites. The only thing left are the generic tells.

@Camo

I am aware of the ability to block guild invites. I have it turned on. I should not have to deal with this mess. Blizz isn't banning the addon atm however if enough people report the tell as spam, the sender and user of the addon gets a temporary ban. Also I should not have to install an addon from this author to block his invite addon. I wish Blizz would just break the addon. I am seeing them take a more passive approach and telling the users who get the temp ban to use the ingame methods. Trade Chat, guild recruitment option in game etc.

I put people on ignore and mark a guild name next to them to know who to avoid. Zerg invites and tells are not cool. The fact that Blizzard even implemented the block is a sign to me that this is a problem.

There is a way to block all guild invites.
I believe it's: Interface - Controls - Block Guild Invites

@Key, that only blocks the join/decline window from popping up. There's nothing that stops an addon that goes through a /who list in a zone and whispers every unguilded person in it. That's the annoying part; when there's 5 or 6 people all using that same addon whispering you.