EA SMTP Server for Windows
Platform:
Windows 2012 - 2025 or later (32bit/x64)
.NET framework 4.5 installed
A 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 as a replacement for IIS SMTP Server 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 connections and email messages destined for the local EA SMTP Server.
- Send Connector: Establishes outbound SMTP connections and relays email messages to remote SMTP servers.
- Submission Queue: Temporarily stores inbound email messages before they are processed.
- Categorizer: Categorizes email messages and routes them to either the delivery queue or a local drop folder..
- Delivery Queue: Temporarily stores outbound email messages before they are sent to remote servers.
- DKIM Signer: Adds a DKIM signature to outgoing email messages for authentication.
- Pickup Folder: Picks up RFC 822-compliant email files and sends them to the submission queue..
- Accepted Domains: Controls which domains and recipients the server will accept emails for.
- User DB: Stores user information; only authenticated users can relay messages through the local EA SMTP Server.
- Throttling Control: Control connection rates and message throughput to prevent server overload.
- Journal: Collects and stores email logs in a local database for auditing and troubleshooting.
IIS SMTP and EA SMTP Server: Key Differences and Comparison
| IIS SMTP Server | EA SMTP Server | |
| Virtual Server | YES | EA SMTP Server does not use the concept of “Virtual Servers”. Instead, it adopts Receive Connectors and Send Connectors, consistent with the design used in Exchange Server. |
| Local Domain and Remote Domain | YES | YES |
| Ssl Certificate | Automatic selection | Automatic and manual selection of SSL certificates |
| Windows User Integration | YES | YES |
| External User | - | YES |
| Pickup and Drop | YES | YES |
| Address Space | - | YES |
| Sender Based Routing | - | YES |
| Inbound and Outboud Throttling | - | YES |
| Outbound IP Binding | Always use primary IP address | Supports manual selection of outbound IP address |
| Opportunisic TLS | - | YES |
| Mutual TLS | - | YES |
| DKIM | - | YES |