It can be done in Control Panel "Main » Users » Mass mail dispatch" according to the following rules:

1. Max message length is 10000 characters.
2. Dispatch can be done not more often than once per 5 hours.
3. Users can subscribe to the mailing list when registering or editing profile.
4. You can create subject categories to which users can subscribe (e.g.: "Site News", "Computer News", "World News"). Max number of categories is 20.
5. A dispatch cannot be broken off so be attentive and don’t click "Start dispatch" beforehand.
6. All emails are sent in the text mode, therefore HTML tags won’t work in the emails.
7. All sent emails are stored to the archive, so don’t write rude emails. If someone will complain about you we will take steps.

Mass emails are dispatched only to the users who have subscribed to it and who have confirmed their emails. Mass mail subscription is VOLUNTARY!

Note: The subscription option will appear in the registration form and user profile ONLY after the creation of at least one mailing category!