If you want to send an email through WordPress and without your theme and plugins, you can do it easily with the code below:
wp_mail( string|string $to, string $subject, string $message, string|string $headers = '', string|string $attachments = array() )
You can fill these parameters :
- $to refer to the mail address (can be an array if there are multiple addresses)
- $subject is your mail title
- $message is the content of the mail. If you want to send your content with HTML, you can change your headers parameter (explained below)
- $headers allow you to add additional headers. For example, for HTML, you can have this line :
$headers = array('Content-Type: text/html; charset=UTF-8');
Be careful if you use variables for your addresses or your mail content with $_POST or $_GET and content from your WordPress users. You should secure this kind of string to be sure your WordPress is secure.
Still stuck ? You can contact an expert.