I have clients (that I host) who do periodic mass e-mailings to their own clients & interested prospects. I believe that all of the recipients fall under an "opt in" character. I use phpList to send out these mailings (of from 25 to 3500 pieces).

Are there any prospective issues do my providing this mass emailing service using one of the VPS servers out of the NYC data center? Is this sort of outbound traffic throttled in any manner?

Bill B.