Stopping Admin Alert SPAM

Okay, I haven't found a good answer to this online and would appreciate any advice this group has... Our servers are being deluged with Admin Alert Spam's. At a certain point, particularly over a weekend, with no one actively looking at the machine, if there are enough messages it can cause some services to shut down. I read that blocking ports 137-139 would stop these messages, but I did that in our firewall and yet the messages still came.

I'm wondering:
1) If I disable the messenger service on the server, could there be any bad ramifications of that, other than potentially not receiving legitimate messages about system shutdowns etc.? Also, would that stop the problem?
2) Is there some other way to stop these messages? Are they coming in on another port etc.?

Any help on this would be appreciated.
Thanks in advance,

Ed Sunder
Three HD Received on Thu Jan 23 12:11:41 2003