a. Enable SMTP Logs
Open Internet Information Service (IIS) 6.0 Manager. Right-click "SMTP Virtual Server" and choose "Properties". Check "Enable logging".
Click "Properties ... " to check all options.
b. Check SMTP Logs
You can check the SMTP log files at C:\WINDOWS\system32\LogFiles\SMTPSVC1.
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 |
| 334 | Server Challenged |
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 |
| 535 | Authentication Failed |
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 |
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