Mailjet vs Postal: What are the differences?
Developers describe Mailjet as "Email delivery made easy". Mailjet is a real-time Cloud Emailing platform: scalable, agile and flexible. Our unique algorithm boosts your deliverability and our platform provides in-depth insight so you can optimize more than ever. On the other hand, Postal is detailed as "Open source mail delivery platform, alternative to Mailgun or Sendgrid". Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers. Postal was developed by aTech Media to serve its own mail processing requirements and we have since decided that it should be released as an open source project for the community.
Mailjet and Postal can be categorized as "Transactional Email" tools.
Postal is an open source tool with 9.02K GitHub stars and 533 GitHub forks. Here's a link to Postal's open source repository on GitHub.