Good Sales Emails - Best sales emails from great companies
100 in 100 Challenge - Get 100 new paid users in 100 days
Good Email Copy - Email copy from great companies.
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Growbots Email Timing Optimizer - Find the perfect time to send your email
Marketing Examples - A gallery of real world marketing case studies. Updated every day.