Unauthorized relay message rejected error when sending mail from local smtp server

This error message comes when we are sending mail from local smtp server of IIS. This error message is very painful. but its is easy to solve this error.

To solve this error follow few steps as described.


1). Click on start menu and go to run command

2). Type inetmgr in run command and hit enter.

3). Right click on “Default SMTP Virtual Server” and choose property as shown in image.

SMTP Properties

4). Go to access tab and click on relay button as shown in image.

Relay Restriction


5). Click on All except the list below. and again run your web application, this will solve your problem.


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