The panel users invites email is missing an important header.
MIME-Version: is an email header indicating the message uses the Multipurpose Internet Mail Extensions (MIME) standard, most commonly 1.0, enabling emails to carry various content types (like HTML, images, attachments) beyond plain text by specifying version and encoding, crucial for correct handling by email clients. It's a required top-level header for MIME-compliant messages, helping troubleshoot formatting issues by detailing message structure.
