If you are managing an on-premises Exchange Server, "Download Domains" are used to isolate attachments and inline images for security (preventing script execution in OWA).
Set-OrganizationConfig -DownloadDomains @{Add="attachments.yourdomain.com"} Use code with caution. owa domain.txt
Are you trying to in Microsoft 365, or are you troubleshooting attachment security on a local server? EnableDownloadDomains blocks picures in OWA If you are managing an on-premises Exchange Server,
The most common use for a TXT file or record related to OWA is to prove you own the domain so you can use it for professional email. owa domain.txt
: Create a new DNS record for a subdomain like attachments.yourdomain.com .
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