How to check SMTP logs in Windows Server (IIS)

You can check the SMTP logs to see what happens. Please follow these steps to set up and check SMTP log files.

a. 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.

b. Check SMTP Logs

You can check the SMTP log files at C:\WINDOWS\system32\LogFiles\SMTPSVC1.

c. Understand SMTP logs

You can open the log file and check the email logs. The most important field is the status code. "250" means ok.

Here are the meaning 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

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