What are some alternatives?
When comparing How to Nail Cold Email and Great Email Copy, you can also consider the following products
Good Email Copy - Email copy from great companies.
Really Good Emails - A large collection of good product email design.
Templates by EmailOctopus - Free (do whatever you want) responsive email templates
Good Sales Emails - Best sales emails from great companies
Cold Email Generator - Quickly create a 5-touchpoint email campaign
Smart Compose in Gmail - Write emails faster with Smart Compose in Gmail