Emailing all users when there is a post in specified forum?

[BigJohnny]

I'm just toying with the idea of a local board for freecycling in my community,and one feature that's very important is emailing users when new stuff is posted or wanted etc.

I've been looking through all the settings but haven't used vB in quite some time.

Is there a way to set a certain forum to send an email to all users, whenever any post is made in that particular forum?

The reason for this is, as part of the groups I'm in, when someone wants to give something away, they post to the group, which is then emailed to every user of the group so everyone can see whats being offered. The same applies basically to any post of the group.

I want to expand on this with a message board but the instant notification to all users is important. It's basically a mailing list.

the group has two options, instant notification, and daily digest which would send out every post from the day, at the end of the day.