Postal

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.

The application has been running in production for us for nearly 6 months and we will be continuing to use it ourselves and support its ongoing development.

General features

Support for multiple organizations with mail servers & users within. Graphs and stats showing volume of incoming & outgoing mail. Access to view historical messages. Access to view the full outgoing & incoming message queue. Set up webhooks to receive live information about delivery information in realtime. Full access to the last 7 days of webhook requests are also stored for debugging purposes. Built-in DNS checking & monitoring to ensure domains you send mail from are configured correctly for maximum deliverability. Per server retention configuration to set how long messages should be kept in the database and the maximum size to keep on disk. Complete logging so delivery issues can easily be identified. Mail server wide search tools to find messages that need investigation.