Two things come to mind:
1. Do you know who the e-mails are from? Are they a trusted source? If it is spam the subheading could be malicious and your anti-malware protection is working.
2. If you have confidence in the source then are you viewing in HTML or plain text? Plain text is good for protection but restricts a lot of operations associated with e-mails.
Ypou could also have a look at this click here