Symptoms
Consider the following scenario:
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You have Download Domains configured.
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You have a user account whose alias begins in the following characters:
oma*
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You send an email message that includes an inline image or a text attachment to the oma* account.
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You log in to the oma* account by using Outlook on the Web (OWA) to access the mailbox.
In this scenario, the oma* account user doesn't receive the inline image (a broken image icon is displayed instead), and the text file download fails and generates a "page not found" error.
Resolution
To fix this issue, install the following cumulative update:
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Cumulative Update 15 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019
