apple email passwords
how do you change iCloud mail passwords
iPhone 13 Pro, iOS 15
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When Apple ID is signed in the iPhone the mail accounts will be configured Add an email account to your iPhone, iPad, or iPod touch - Apple Support
So the Apple ID password has to be changed Change your Apple ID password - Apple Support
However , those accounts if set with yahoo , gmail the passwords can be changed from web account https://support.google.com/mail/answer/41078?hl=en&co=GENIE.Platform%3DDesktop