What could be causing the issue of duplicate emails being sent when using PHPmailer 5.2.7?

The issue of duplicate emails being sent when using PHPmailer 5.2.7 could be caused by the code logic unintentionally sending multiple emails in a loop or due to a misconfiguration of the email sending process. To solve this issue, you should ensure that the email sending function is only called once and that there are no loops or duplicate calls triggering multiple sends.

// Example code snippet to prevent duplicate emails being sent
// Make sure the email sending function is only called once

// Initialize PHPMailer
$mail = new PHPMailer;

// Set up the email parameters
$mail->setFrom('from@example.com', 'Your Name');
$mail->addAddress('recipient@example.com', 'Recipient Name');
$mail->Subject = 'Subject of the email';
$mail->Body = 'Body of the email';

// Send the email
if(!$mail->send()) {
    echo 'Message could not be sent.';
    echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
    echo 'Message has been sent';
}