[MlMt] What's with the skulls?

[John Cooper]

What's with the skulls that MailMate displays in the return addresses of 
some messages?

![image](https://www.dropbox.com/s/iwfzu880yxqp4io/skulls.png)

I've viewed the raw messages to try to figure out what prompts this kind 
of display, but I only see an @ symbol.
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