Show HN: TogetherLetters – Group newsletters with no app, no feed, no login

TogetherLetters is a group newsletter service that requires no app, login, or feed. Users receive periodic prompts to submit short updates via email, which are compiled into private newsletters sent to the group. The service has grown to over 5,000 users across nearly 1,000 groups and has sent more than 100,000 update prompts.