Postal - Open source mail delivery platform, alternative to Mailgun or Sendgrid
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.
Mailook - Identify & fix your email deliverability issues for free 👀
Semplates.io - Create, edit and manage all your email templates on AWS SES with ease.
Mailivery - Reach the Inbox, not the spam folder.
WP Email Delivery - Managed email delivery for WordPress