Consider the effects on your mail server with that much mail being set at once. You might need to set some internal LISTSERV variable as to how big a batch of RCPT TO:s it generates. Will you want the mail sent via BCC :or an explicit TO: ? I would suggest that you consider opt-out including the use of other e-media including WEB pages and local Usenet. Also, using confirmation via the OK mechanism would seem prudent, to foil spoofers. Who/How are bounces going to be handled due to "host not found," "mailbox full," or "no such recipient?" What are you plans for handling customer REPLY (legit or illegit)? /Pete