Thank you for contacting us on Microsoft Q&A forum.
Based on the information provided by you during learning process, we understand that you are facing with accepted domain statement.
Statement which provided in learning module more suitable depending on the specific context or emphasis you intend to convey regarding the role of the accepted domain in relation to message handling by the Exchange organization and both versions convey the same essential meaning.
If you find this information beneficial, we kindly request you to accept the answer by clicking the "Upvote" and "Accept Answer" buttons.
If you encounter any further issues, please feel free to attach screenshots for reference and notify us in the comments. We are here to assist you.
(NOTE: Please ensure all personal details are concealed before posting).