Masters of Adobe Campaign,
Has anything changed in terms of the email app on IOS 15 and privacy?
Some of the older email templates we use don't render correctly on IOS 15.
Are you aware of any recommendations?
In order to know how any changes/updates have affected your instance we need to know your acc server/client version as well as hosting design.
You may check in the release notes to see if there are any updates relevant to your version https://experienceleague.adobe.com/docs/campaign-classic/using/release-notes/latest-release.html