For highlighing email addresses in Gmail 'to' fields that don't fit certain rules - ie. that are being sent outside the company.
Gmail External Email Highlighter Extension
This way your users can easily see if they're accidentally sending an email to someone outside of the company.
Or you could just put your bosses email in to make sure you're never caught out by not noticing them in the CC box!
Email rules are set using regex.
Source Manifest.json
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