Trying to test the Office365 SMTP Relay Service to troubleshoot an issue I had with email sending today I came across this little useful command in PowerShell. All I had to do is enter the credentials and then send a test email.

1. To open PowerShell right-click the start button and Choose Windows PowerShell.
   
   
2. Enter the following command

   $msolcred = get-credential

3. A window pops up. Enter your office365 credentials there.

   

4. Then use the Send-MailMessage command to send a test email

   Send-MailMessage –From georgia.k@c***i.gr –To georgia.k@c***i.gr –Subject “Guess what!” –Body “I am Testing the SMTP Relay Service from PowerShell” -SmtpServer smtp.office365.com -Credential $msolcred -UseSsl -Port 587

   

5. If there is no error check your inbox for a new email!

   

   If there are any connectivity or other issues, you can see the error and troubleshoot accordingly.