Do iCloud hosted custom domain emails support Mail Drop?
iCloud email accounts named xxx.icloud.com support Apple Mail Drop for large attachments. If I host my custom domain at iCloud will it support Mail Drop?
iPhone 12 Pro, iOS 15
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Using a custom domain with iCloud will work the same way that iCloud Mail works—except it will use your own domain instead of a generic Apple/iCloud one. The platform is the same and the only difference is the email address that you’re using on the iCloud platform.
That being said, I’d fully expect that feature to work with your domain.