Disallow Email Posting

A mailing list can be set to disallow all email posting and require all postings to be contributed through the web interface in Utilities: List Settings: Email Submitted Content: Security. This allows you to get rid of all the authentication issues that accompany email and is considered very secure.

Some sites put the web interface on a web server behind a firewall, where no one from the outside can reach it. In addition, most web servers have password-based security access features and the entire web interface be protected with this password.