How do I automate the highlighting of WORDS and/or PHRASES in the content of my emails

How do I automate the highlighting of WORDS and/or PHRASES in the content of my emails

We forward emails (ORDERS) everyday to our suppliers.

Does anyone know if there's a way to automate the highlighting of words or phrases in the content of an email?

Basically, we want to designate certain WORDS of PHRASES to appear with highlighting when received by our suppliers.