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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.

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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.

or

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.

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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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