Hello chexmix,

Have you tried to use Email::Send::Gmail or Email::Send::SMTP::Gmail. They seem to be using a free Web-based email service provided by Google. I assume that they will provide better format that your designed. Give it a try and let us know if it works as expected.

Also you can take a look on an older similar question Sending mails via gmail.

Looking forward to your reply. BR / Thanos