SendOut - Affordable email marketing for bloggers and influencers
Sidemail - The simplest way to send transactional emails. Sidemail makes sending transactional emails trivial, it's perfect for side projects, MVPs or the next big thing.
Mailblast - Email marketing on a budget using Amazon SES
Mailivery - Reach the Inbox, not the spam folder.
Platformly - Platformly is a suite of tools for multi-channel marketing automation.
Postal - Open source mail delivery platform, alternative to Mailgun or Sendgrid