How to contact a list of users?

I'd like to contact a number of users on a list I got from the search function of the forum (about 300 users). I could send them a PN. However, PNs are limited to 5 users at a time, so I'd have to copy-paste this about 60 times. Is there a more convenient method?

(The plan is to start a group of diyAudio members of Switzerland, so it might get more fun / efficient to exchange stuff locally.)