LetterIt is a Web-based mailing list manager that is simple to install and available In several languages. It can send messages to a mailing list via PHP Mail, sendmail, qmail, SMTP, or pickup mode (only Windows) in HTML/Text or text format with attachments. Messages are delivered in the background, and after starting the browser can be closed. A template system and a WYSIWYG editor are provided, and confirmation mails are sent after subscription and unsubscription requests. It also supports a blacklist, statistics, version checking, user management, and much more.