I want to send email to the users of my site, individually or to all of them at once.
Is there any available module?

I am using Drupal 6.


Use this Mass Contact module it will match your requirement.

The Mass Contact module allows anyone with permission to send a single message to multiple users of a site, using its roles functionality.


The Advanced User Module allows users who have "administer users" permission to send mail to selected groups of users, and that includes selection by role.


For an overview and comparion of Drupal newsletter modules, see this page on Drupal.org: Comparison of email newsletter oriented modules.

For an advanced solution that let you send HTML-styled newsletters, look at Simple news. For a basic mass mailing module, my choice would be Mass contact.

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