GNU Mailman

Mailman gives subscribers control over how list messages arrive. A subscriber can receive each post or a digest, suppress a duplicate when already copied on a message, and temporarily disable delivery while remaining subscribed. Delivery disabled for a holiday must be re-enabled manually.

Preferences can apply globally, per email address or per list, with the more specific setting taking precedence. One account can hold several addresses, and subscriptions made through the primary-address option follow a later change to that primary address. For an association with several committees, this gives members a way to manage list behaviour without maintaining a different account for every address.

Mailman is a suite to deploy and administer. Its documented member instructions assume the standard Postorius web interface and related components; a customised installation can present different screens. It fits ongoing group correspondence and announcement lists where moderation and member preferences matter.

The software is free under an open-source licence; a server and someone to administer it are separate requirements. To manage web preferences, choose sign up on the list's information page, confirm your email address and return to Subscribe to this list. Existing email subscriptions can be linked to an account using the same address.