"Hello [first name],
I'm working at [my company] and my name is [name]. The reason why I'm reaching out to you is that I believe that I can help you and [company name] with [your value proposition].
Our customers have [a truthful and powerful number on how you have helped customers to either increase their revenues with X or cut their costs with Y]. Some of our current customers are [some of your main customers to build a proof of concept. Important is that they've given an OK before you mention them!].
If you find what you read above interesting - see the short demo (60 sec) below:
[Preview (GIF) to your vaam]"
See this short Vaam through email for inspiration: