Symptom: Bounce back message received when sending email using PHP mail.
Cause: Email providers like Outlook will reject the message if the recipient does not have wordwrap enabled for HTML emails and the email contain lines longer than 65 characters.
Solution: Use the wordwrap function to wordwrap your message.
Example: $message = wordwrap($message, 70,"\r\n");
Last Updated: September 13, 2022
