This CiviCRM extension provides a daily scheduled job named "Call Email2Each.Sendemails API (Daily)" This job expects 2 parameters: a group name and a message template name. When this job runs, it will send an email to each contact in the group/smart group. The contents of the email will be the message template.
While it may seem odd to want to send the same email to the same contacts daily, this scheduled job is commonly used to target a smart group (where the contacts in the smart group change daily), and the message template includes tokens that display different data depending on the current date.
While the extension will install cleanly by itself, it needs the extension https://civicrm.org/extensions/e-mail-api to be useful.