Not all are accepted. The mentors make a decision based on their knowledge of abuse issues and in an overriding duty to keep the list as safe as humanly possible. It is not possible for someone who is on the mailing list to get the email address of others who are on the list. Our majordomo program has been upgraded and altered to remove this possibility. The mailing list is reasonably secure.
Email is only total secure when it is encrypted.
In order to heal we must open up which does involve risks. Now that you have a better understanding of how the SNAP mailing list works you can decide if it is secure enough for you.