What are common issues when using PHP Mailer for sending emails?

One common issue when using PHP Mailer for sending emails is that emails may end up in the recipient's spam folder. To solve this, you can set the "From" address to a valid email address from the same domain as the SMTP server you are using.

// Set the "From" address to a valid email address from the same domain
$mail->setFrom('valid@example.com', 'Your Name');