Set YOUR_DOMAIN_NAME,YOUR_API_KEY,EMAIL_FROM,EMAIL_NAME_FROM at index.php

• check content.html has the text to be sent
• check subject.txt has the subject to be sent
• check folder files that has attachments pdf,doc,jpg to be sent
• check emails.txt that has emails separated by comma.

Finally,

in index.php set

• $timeTosend='11:10:00';
• $dayTosend='2023-03-21';
• $zone="+0200";// This is for Athens,Greece

That's it.