This plugin works on Elgg 1.6.x - not tested elsewhere, though very few changes should make it work on further Elgg versions.

Multisite-ready.

This tool lets admin send mailing and newsletters to a custom/CSV list of emails (comma, space or break separated list).

Emails pre-selections : site membres, multisite members, self and site's addresses, plus admin-set additional email.

Admin can also set a mailing template and choose whether local admins can access this tool or not (multisite-only feature).

Tips are detailled while using the plugin.