WordPress.org

v3.0

• Addition of statistics panel and sent statistics for individual messages
• Removal of send probability
• Redesign of "Messages" panel
• Support for multipart messages
• Change from <$VAR> syntax to [var] in messages
• Removed support for (controversial) eval()ulation of code in messages.
• Support for shortcodes to be used in messages
• Move to HTML templates -- write just a "text" version of the message, and it will be placed in HTML layout (with HTML-specific shortcode output and HTML-only content available)
• "Restrict by tags" and "Restrict by categories" simplified.
• Live preview of text/HTML message when editing
• Remove message defaults
• Move "do not send more than [n] messages" to message-level.
• Removal of "comment gap" and "send gap" settings
• Changes to upgrade mechanism
• Use of WP_List_Table for displaying messages.

v2.0.0.1

• Fixes a bug which displays ~'Sorry: you need to be an administrator' message for all users.

v2.0

• Multiple messages
• 'Better' i18n support
• nl2br() functionality, to make writing HTML messages easier.
• Syntax highlighting for PHP (limited support).
• User restrictions (ie, only send to logged in users)
• Opt out page.
• Modularised interface (and code).

v1.5.3

• Uses different mode of scheduling sends, which is hopefully more reliable than WP-CRON.

v1.5.1

• Fixed some minor timing issues.
• Fixed menu formatting in WP 2.7.

v1.5

• Uses WP-Cron to process queue at regular intervals.
• Comes with pre-installed "templates", which allow you to quickly place titles, excerpts and URLs into your emails dynamically.
• Allows you to restrict posts by tags and categories.