Postal

Postal is a mail server solution designed for managing and sending large volumes of email efficiently. It supports handling transactional, bulk, and incoming email for organizations. With advanced routing, detailed tracking, and user-friendly management tools, Postal simplifies email operations while providing robust analytics and high deliverability.

Key Features

• Support for multiple organizations with mail servers and users within.
• Graphs and stats showing volume of incoming and outgoing mail.
• Access to view historical messages.
• Access to view the full outgoing and 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 and 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.
• Send messages to the SMTP server or using the HTTP API.
• Manage multiple credentials per server.
• Support for DKIM signing of outbound messages.
• Enable development to hold messages in Postal without actually delivering them to recipients (message can be viewed in the Postal interface).
• Built-in suppression list to avoid sending mail to recipients that don't exist or can't accept e-mail.
• Click and open tracking to keep track of when recipients open your e-mails and click links within them.
• Configure per-server send limits to avoid abuse on mail servers.
• Management of multiple pools of sending IP addresses.
• Configure different senders or recipients to have mail delivered from certain IP addresses.
• Mail tagging so certain e-mails can be given a tag to allow them to be grouped when needed. For example, you may tag receipts or password-reset e-mails as such.
• Ability to forward incoming e-mail to HTTP endpoints.
• Ability to forward incoming e-mail to other SMTP servers.
• Ability to forward incoming e-mail to other e-mail addresses.
• Spam & thread checking with SpamAssassin and ClamAV with configurable thresholds and different methods for dealing with spam messages.