Mass turnoff of email notification?

[Flare945]

I would like to turn off email notification upon PM's and emails for ALL my users. (turn off ALL email notification on the board)

is there a hack that does this? if not, can someone write it?

this is because some of my users used fake email addresses before we turned on the "enforce real email" feature or whatever it is, and now when they reply to a thread or pm, the webserver tries to send a mail, and gets a mailerdameon msg in return cuz thre is no email addy like that, and the host is gettin mad