[MlMt] Remove elements from emails

[Giovanni Lanzani]

Hi,

Our IT admins added those pesky warnings to all emails incoming from 
outside the companies.

The HTML injected looks like


```html
<span style=3D"color:#0075CF">
External Warning: This email is from
… - if this email address is unfamiliar, do not click links and
  do report via the Report Suspicious button in Outlook.
</span>
```

It thought of getting rid of this through CSS, by adding

```
span[style*="0075CF"] { visibility: hidden}
```

Updating the MmDefaultCSS variable in `com.freron.Mailmate` or putting 
that same line in `~/Library/Application 
Support/MailMate/Resources/css/stylesheet.css` didn’t produce the 
required effect so I'm a bit puzzled.

What could I try next?

Giovanni
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