Q: How does people subscribe/unsubscribe to mlmmj controlled mailinglists?
A: They send a mail to listname+subscribe@domain.tld or
   listname+unsubscribe@domain.tld. So if we had a list called jokes@humour.org
   people would send a mail to jokes+subscribe@humour.org to subscribe and
   jokes+unsubscribe@humour.org to unsubscribe
