smtp logging
SMTP Service
The IIS SMTP service is a simple component for forwarding e-mail messages to an SMTP server for delivery. To send e-mail from an ASP.NET Web application, you must have the Internet Information Services (IIS) Simple Mail Transfer Protocol (SMTP) service installed and configured on your server. The IIS SMTP service is a simple component that sends e-mail messages to an SMTP server for delivery.
Installing the SMTP Service
IIS does not include the SMTP service by default. The SMTP service must be installed using the Control Panel. When you install the SMTP service, it generates a default SMTP configuration that you may eventually change using IIS Manager.
The SMTP service is configured using the IIS 6.0 Manager!
To install the SMTP service on IIS 6.0
- On the Start menu, click Control Panel, double-click Add or Remove Programs, and then click Add/Remove Windows Components.
- In the Components list, click Application Server, and then click Details.
- In the Subcomponents of Application Server list, click Internet Information Services (IIS), and then click Details.
- In the Subcomponents of Internet Information Services (IIS) list, select the SMTP Service check box, and then click OK.
- Click Next. If you are prompted for the Windows CD or the network install path, follow the instructions.
- Click Finish.
When you install the SMTP service, a standard SMTP server setup with a message storage at C:\Inetpub\Mailroot is created. When configuring the SMTP service, you may define global settings as well as settings for particular components of the virtual server. The IIS SMTP service is only a relay agent. E-mails are routed to an SMTP server for delivery.
To start IIS Manager from the Run dialog box
- On the Start menu, click Run.
- In the Open box, type inetmgr and then click OK.
To start IIS Manager from the Administrative Services console
- On the Start menu, click Run. In the Run text box, type control panel, and then click OK.
- In the Control Panel window, click Administrative Tools.
- In the Administrative Tools window, click Internet Information Services.
How To Check SMTP Logs in Windows Server (IIS)?
- Enable SMTP Logs
- Open Start > Programs > Administrative Tools > Internet Information Service (IIS) Manager. Right click “Default SMTP Virtual Server” and choose “Properties”. Check “Enable logging”.
- Click “Properties …” to check all options.
- Check SMTP Logs. You can check the SMTP log files at C:\WINDOWS\system32\LogFiles\SMTPSVC1.
- SNow you can open the log file and check the email logs. The most important field is status code. “250” means ok.
Understand SMTP logs
You can look at the email logs by opening the log file. The status code is the most significant field. “250” indicates Ok. The following are a list of SMTP status codes.
| Status Code | Description |
| 211 | System status, or system help reply |
| 214 | Help message |
| 220 | Service ready |
| 221 | Service closing transmission channel |
| 250 | Requested mail action okay, completed |
| 251 | User not local; will forward to |
| 354 | Start mail input; end with “.” |
| 421 | Service not available, closing transmission channel |
| 450 | Requested mail action not taken: mailbox unavailable |
| 451 | Requested action aborted: local error in processing |
| 452 | Requested action not taken: insufficient system storage |
| 500 | Syntax error, command unrecognized |
| 501 | Syntax error in parameters or arguments |
| 502 | Command not implemented |
| 503 | Bad sequence of commands |
| 504 | Command parameter not implemented |
| 550 | Requested action not taken: mailbox unavailable |
| 551 | User not local; please try <….> |
| 552 | Requested mail action aborted: exceeded storage allocation |
| 553 | Requested action not taken: mailbox name not allowed |
| 554 | Transaction failed |
In fact, Windows Server 2016 still uses IIS 6 tools to host and manage the SMTP service. This is truly remarkable that a fundamental service like SMTP has not been changed for at least the last 13 years. The old adage of, ‘If it isn’t broken, do not fix it’ comes to mind.
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