2025-07-08
🔗Update handling of the '@' character in signatures names
Microsoft no longer allows '@' in roaming signature names as it is reserved for internal use, and Microsoft Outlook will follow soon.
This hotfix addresses this change as follws:
-
Add '@' to the list of invalid characters for signatures names as documented in sample INI files. The new complete list of invalid characters is '\/:"*?><, @'. - Convert all invalid characters to '', but '@' to '_at'.
- Only keep the '@' character where it is required for Microsoft internal use in roaming signature names.
For a comprehensive list of all changes, dependencies, and fixes, please consult the official CHANGELOG.
🔗Turn every small email moment into a professional advantage
Email signatures and out-of-office replies may seem minor, but think about how often people see them.
We help organizations centrally manage and standardize these touchpoints across all users — unified Outlook branding everywhere, with zero external data exposure. No manual effort, no inconsistencies, no data leaving your environment. With Set-OutlookSignatures, every email becomes a consistent, secure, and fully controlled brand experience.
👉 See what’s possible for your email setup
→ See how it works (2 min)
👉 Want to try it yourself?
→ Quickstart
Not responsible for email setup in your company?
Share this article with your IT department or marketing team, they’ll thank you for it.