Hoofdstuk 45. Mailing lists

1. Are there any PHP mailing lists?
2. Are there any other communities?
3. Help! I can't seem to subscribe/unsubscribe to/from one of the mailing lists!
4. Is there an archive of the mailing lists anywhere?
5. What can I ask the mailing list?
6. What information should I include when posting to the mailing list?