Simplenews

Sending newsletters in HTML...no problem. Send them scheduled with Simplenews Scheduler and Swiftmailer.

There are some examples.

Drupal8_002096.png

You can choose HTML

Swift Mailer

This module has to be installed with Composer (see contribution Composer). The module is dependent from the Mail System module. You can send HTML mails with it. Webform uses Swift Mailer.