Really Good Emails - A large collection of good product email design.
Hacker News Stack - Focus on the really fresh and unread news in Hacker News.
Good Email Copy - Email copy from great companies.
Hacker Newsletter - Best of Hacker News in your inbox every Friday.
Good Sales Emails - Best sales emails from great companies
Box Piper Hacker News - Re-Imagined Hacker News for this decade.