Outlook: 550 5.7.1 Client does not have permissions to send as this sender

Issue: User configured Outlook (POP3). He able to receive email but unable to
send  email.
Bounced message:
test_gmail
(550 5.7.1 Client does not have permissions to send as this sender)

Solution:
1) make sure username and password are correct
2) Check E-mail Account settings again,
confirm:
1)email address
2) Incoming mail Server and Outgoing mail Server
3) Username and password
4) server port numbers

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