Possible Performance Hit

[AthenaOfDelphi]

It wasn't just mail these connections were appearing on which is why the connection limit is affecting everything.

It appears to be some kind of TCP SYN attack as the connections are in the SYN state as though the server has responded to the SYN request with a SYN+ACK and is waiting for the client to return ACK.

[SilverWarior]

It appears to be some kind of TCP SYN attack as the connections are in the SYN state as though the server has responded to the SYN request with a SYN+ACK and is waiting for the client to return ACK.

Well this is a completely different matter then.
Here is what I'm wondering. Who would want to launch a TCP SYN Flood attack against PGD? What would they gain by doing this?
Now if you perhaps host some other sites from your servers it it possible that one of them might be the actual target for the TCP SYN Flood attack. Perhaps they might be even executing TCP SYN flood attack toward PGD in order to make it less obvious that they are attacking another site on your server since clogging the server would take down all of the sites hosted on it any way.