Don't expect to feel the effects soon. I'll be switching hosting providers next month because of a stunt mine pulled a little over a year ago. My case isn't too different from this one.

They disabled my service because of an excessive amount of SMTP connections. The fact that I wasn't sending bulk emails but target of a brute-force attack obviously didn't cross the banning script's mind. What bothered me wasn't the clbuttic mistake of a banning script checking the wrong thing (incoming SMTP connections? really?) but the fact that my service was disabled without any notification whatsoever.

Instead of being mildly amused because all it takes to launch a successful DoS attack on my server is a computer that can connect to port 25 and 5 minutes of time, I was pissed because my web and email server was down for two days due to a script kiddie and an incompetent provider. Maybe not I'm-leaving-now-although-I-already-paid-for-the-next-15-month pissed, but definitely I'll-switch-providers-before-the-next-billing-cycle-begins pissed...