Can read message body from one sender outlook 2013

[DDS2126]

In outlook when I receive emails from only one specific person the format is different. The body of the message does not display. I see an envelop icon, the word message, and links to all the attachments as well as the hyperlinks in his signature. Other emails to the same inbox from other people arrive normally.

This person sends mail from a MAC but we are both using the same email domain.

Any ideas?

[DDS2126]

I keep receiving emails from one MAC user that look like this. How do i fix it?

Please help. This is my boss's email