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The Mime Mail module gives Drupal core and other Drupal modules the ability to send HTML email messages. This is an all-Drupal solution that does not require external third-party libraries.

Features include:

Sends multipart messages in MIME-format.
Plain text version of the HTML body may be automatically generated, or an alternative plain text body may be used if desired.
Provides a simple API for adding attachments to email.
If the HTML has embedded graphics, these graphics are MIME-encoded and included as message attachments.