How do I send an email to every user on my system?

there are probably 1000 different ways to do it, here are 3 of the best:

1. generate a list of all of your users, add them to an ezmlm list, send a message to the list. In my opinion, this is the best way to do it, because users can choose to opt out of future announcements if theywish, by unsubscribing from the list.

2. use vpopmail's 'vpopbull' program. Running it by itself gives its usage information, which you should be able to take from there yourself. If you need assistance with that, those questions do belong on the vpopmail mailing list (vchkpw)

3. use Russell Nelson's qmail-popbull program (http://www.qmail.org/top.html#addons) to put the message in the user's mailbox just as they pop their email. I have not used the latter two programs to do this (I use the ezmlm style for my users) however, Russell Nelson's is nice because it onlydrops the mail in their mailbox when they pop their mail, so it would beless load on the system when posting a bulletin *shrug*