What is your version of a "perfect" cold prospecting email?

Being in the Enterprise segment, contacts are limited and at-bats are finite. How do you make sure each "touch" is of high value especially to accounts that you have very little traction in?

We have been trained on the "Why You Why You Now" email format - basically making sure you do a ton of research prior to reaching out to a specific contact and your message is concise and relevant. Curious to hear other versions of cold prospecting emails and how successful they have been for the Bravado community.