Schedule this gmail

Code.gs

//FILL THIS LIST AND ADD 1 (OR MORE) TRIGGERS TO SEND

// This is the list of mails to send; add a new line for each email to send daily.
// 'recipient' needs to be specified; 'subject' and 'body' are not needed.
const listToSend = new Set([
  {recipient:"[email protected]", subject:"subject0", body:"body0"},
  {recipient:"[email protected]", subject:"subject1", body:"body1"},
  {recipient:"[email protected]", subject:"subject2", body:"body2"}

]);

/****************************************************************************************************/

/**
 * This is the main function.
 * Sends all the emails and updates the triggers.
 */
function sendScheduledEmails() {
  const now = new Date();
  listToSend.forEach(function(value){
    try{
      GmailApp.sendEmail(value.recipient, value.subject, value.body);
      console.info("[" + now.toDateString() + "] Email sent to: " + value.recipient);
    } catch(err){
      console.error("[" + now.toDateString() + "] Error in sending email to: " + value.recipient);
      }
    })
}

This is a Google Apps Script which schedules the emails in the list above to be sent at every execution (activated by triggers).
Copy this code in a new Google Apps Script project, add Gmail as service, fill the list at the top of the code with each email and setup one or more triggers to run sendScheduledEmails function.