Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
SendOut - Affordable email marketing for bloggers and influencers
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Mailzak - Give a boost to your #EmailMarketing
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
Mailblast - Email marketing on a budget using Amazon SES