Spam filter for native Apple iPad or iPhone mail app?
My parents refuse to move from their Cincinnati Bell email address which has terrible spam filtering, so they are getting a lot of spam in their inbox using the native mail app on their iPad. Are there settings that can be changed on the iPad or a 3rd party app that can be installed to provide spam filtering within the native Apple mail app? Is there a different iPad mail app that will provide client-side spam filtering (apparently they use Outlook on their windows laptop and it appears to provide client-side spam filtering)? I've already tried linking their account to gmail (via Gmailify function) to get gmail's spam filtering function but their provider - Cincinnati Bell (fuse.net) - doesn't qualify as a supported domain.
Thanks for any help.
iPad Pro 12.9-inch, 3rd Gen, Wi-Fi