As an Exchange Online Administrator, a setting you may want to pay attention to is the use of Rich Text Format in Remote Domains. When this setting is set to Always or Follow User Settings, it usually means that emails sent through the server are using Microsoft’s proprietary Tnef Format. Depending on the recipient’s email server and client, this could cause things like getting an attachment of winmail.dat or seeing CID links (like ) instead of inline images within the body of an email. There are a few places this setting could be implemented ranging from the sender’s client,

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