This project runs a vanilla version of Bootstrap by way of CDN.
MyPHPMailer is used to send the e-mails.

This project has three main forms:

1. Subscribe Form: The click event of the submit button is overridden in Subscribe.js which gets the form data and executes a fetch to Subscribe.php. The php returns an error if the e-mail is invalid. Else it tries to read subscribers.txt by way of AccessSubscribers.php, which may throw a variety of exceptions. subscribers.txt is an associative array with the e-mails as indices. If already subscribed it throws an exception, else it adds the e-mail and associated name (which can be empty) and gives a confirmation.
2. UnSubscribe Form: The click event of the submit button is overridden in UnSubscribe.js which gets the form data and executes a fetch to UnSubscribe.php. Exceptions and confirmations are generated.
3. Send Mail Form: The click event of the submit button is overridden in SendTheMail.js which gets the form data and executes a fetch to SendTheMail.php. The sending of any individual e-mail is done by way of MyPHPMailer.php and can take several seconds. A fetch is used to start the processing of the e-mails. Each e-mail will return a response. Another fetch needs to be done until the response contains ERROR or ALLDONE.

• This project initiates the debugging by calling index.php which invokes ContactForm.html so that both JS and PHP can be debugged. See the URL of the debug configuration for details.
• All of the forms use the results-field to display any messages, by way of SetResultsAndSpinner.js.
• Only the Send Mail button supports the spinner, which only shows up while the e-mails are being sent.
• MyPHPMailer gets its credentials from .env by way of MyDotEnv.php.
• It is insecure to store .env in a non-local repository.
• The e-mail that is sent has an unsubscribe button that will invoke the website with the e-mail already in the unsubscribe field. This is handled by CheckForQueryString.js
• The body of the e-mail was taken from an example downloaded from BeeFree. It is a complicated structure of nested tables to do just a simple e-mail. This is because all e-mail tools support tables, but not all support divs. The HTML is in heredoc format in EmailBody.php Variables can be inserted.