EA SMTP Server for Windows (beta)

Platform: Windows 2012 or later (32bit/x64)
.NET framework 4.5 installed

A full featured Windows SMTP Server as IIS SMTP alternative which supports DKIM, opportunistic TLS, message throttling, accepted domains, multiple receive connectors and send connectors. It is designed to be simple to relay email message from Windows Server. Full journal for each email message and customized sender based routing are supported as well.

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EA SMTP Server Architecture

The following diagram shows the relationships among the components in the EA SMTP Server.

  • Receive connector: accepts inbound SMTP connection and email message to local EA SMTP Server.
  • Send Connector: creates outbound SMTP connection and relay email message to remote SMTP server.
  • Submission Queue: stores inbound email message temporarily.
  • Categorizer: categorizes email message and submit the message to delivery queue or local drop folder.
  • Delivery Queue: stores outbound email message temporarily.
  • DKIM Signer: signs email message with DKIM signature.
  • Pickup Folder: pickup the rfc822 email file to submission queue.
  • Accepted Domains: controls what domains and recipients can be accepted
  • User DB: stores user information, authenticated user can relay message from local EA SMTP Server.
  • Throttling Control: throttles the connection and message rate.
  • Journal: collects and stores log to local DB.