iPad and Apple Mail
A pal asked me if it were possible to set up mailboxes and mail rules on his iPad.
I just Googled around for an answer and found an Apple Support thread from 2012 which said that this is not possible.
Is this still the case?
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Multiple mailboxes can be added to iPad and iPhone devices - however, beyond simple junk and blocking rules, manual configuration of mail filtering rules are not supported by iOS/iPadOS.
Add an email account to your iPhone, iPad, or iPod touch - Apple Support
For iCloud mail, you have more control - but must configure rules using a web browser:
Set up rules to filter email in Mail on iCloud.com - Apple Support