Are the FreeBSD mailing lists open for anyone to participate?
Again, this depends on charter of each individual list. Please read the charter of a mailing list before you post to it, and respect it when you post. This will help everyone to have a better experience with the lists. If after reading the above lists, you still do not know which mailing list to post a question to, you will probably want to post to freebsd-questions (but see below, first). Also note that the mailing lists have traditionally been open to postings from non-subscribers. This has been a deliberate choice, to help make joining the FreeBSD community an easier process, and to encourage open sharing of ideas. However, due to past abuse by some individuals, certain lists now have a policy where postings from non-subscribers must be manually screened to ensure that they are appropriate.
