Disable Internationalized Domain Names (IDN) in Outlook
- Policy ID
- L_DisableInternationalizedDomainNamesIDNinOutlook
- Scope
- User Configuration
- Supported on
- At least Windows Server 2008 R2 or Windows 7
- Source
- Microsoft 365 Apps / Office Administrative Templates (version 5568.1000)
- Category
- Microsoft Outlook 2016 › Outlook Options › Mail Format › International Options
Description
By default, Outlook supports Internationalized Domain Names (IDN) for SMTP addresses in Outlook if Windows provides the appropriate support for this feature. You can disable IDN support so that Punycode rather than native characters are used for rendering SMTP addresses.
You might choose to disable IDN support in Outlook if you do not typically expect non-ASCII characters in SMTP addresses.
This setting does not affect the support of IDN in URLs.
Registry
UserHKEY_CURRENT_USER
- disableidnREG_DWORD