EMail Server: Client does not have permissions to send as this sender

ISSUE: ERROR: 550 5.7.1 Client does not have permissions to send as this sender
WARNING: Email: 550 5.7.1 Client does not have permissions to send as this sender

SOLUTION: Configure “Send As” permission on your mail server so that agent accounts can send email as your outbound mailbox account. Below are instructions on how to do this in some of the more common email server/providers.

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