Incoming Email getting deliver from Server,not from outlook

Question

I have successfully configured Central Admin settings/Exchange settings for Incoming email in SP2016. I am able to send email using below powershell commands from SMTP server , where [email protected] is the email address for doclib.

Send-MailMessage -To [email protected] -from [email protected] -Subject "UAT Testing" -SmtpServer "SMTPSERVERNAME"

However , if I send email from my outlook to the above address , it doesnt get stored in doclib. Any inputs would be helpful.