growth.email - Weekly curated email with the best growth marketing articles
Cold Email Generator - Quickly create a 5-touchpoint email campaign
Great Email Copy - A dose of emails from around the web.
Cold Email Analyzer by Mailshake - Real-time analysis of email subject lines and copy
GrowthHackingIdea.com - One short, curated growth hacking idea a day to your email
How to Nail Cold Email Ebook - Create unbeatable sales outreach campaigns