**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 is developed by [Krystal](https://k.io) 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.  * [Documentation](https://docs.postalserver.io) * [Installation Instructions](https://docs.postalserver.io/install/prerequisites) * [FAQs](https://github.com/atech/postal/wiki/FAQs) & [Features](https://github.com/atech/postal/wiki/Features) * [Ask for help](https://github.com/postalserver/postal/discussions) * [Slack Channel](https://slack.k.io)