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What do you mean by “Mailbox name not allowed. The server response was: 5.7.1: Sender address rejected:not owned by user {username}” ?

This error occurs when the sender email address does not match with the sender domain added which was configured in your Pepipost account. Suppose you have added xyzlinkabc.com as your domain then your sender email address should be info@xyzlinkabc.com or support@xyzlinkabc.com.