Sign up for the Contact Improv Boston Listserv here.
It is managed by Yahoo Groups. You'll receive an email from them...
Respond and you're on.
The list is announce-only; it posts a few messages each week about contact improvisation events in and around Boston. Messages will have [CIB] at the beginning of the subject line, so you'll know it's really from us!
To sign up, click this link: Join the [CIB] listserv
You should be transferred to your email software with the above address pre-filled on the "To:" line. Just hit your "Send" button. Yahoo will respond with a confirmation email; answer positively, and you will be added to the list.
NOTE: Yahoo might ask you to add personal info in order to access "additional features" of Yahoo Groups. Don't bother; we only use the email listserv function.
If somehow this does not work, send a message (any message, even a blank one) to firstname.lastname@example.org and that should start the process.