Ok, just a simple thing really, that i do not think should be too difficult to implement.
We already have the ability to check a box “reject duel invites”
How about a place check a box to auto-reject corp invites.
Reason for this: So you do not have to worry about getting such invites and notifications without having to check the mail setting “block unknown users”. This way you do not get corp invites, but you can still receive chat invites and mail from just about any one.
2nd reason for this, is this is EvE and there are many ways of going about to recruit individuals, without going around and spamming every one you see with an actual corp invite.
Leave that spamming crap in games like WoW, SWTOR, and the like.