Try this delete the accounts but when adding them back: ADD a NEW account choosing YAHOO from the list of options. DO NOT USE 'OTHER'.Enter the correct details just as you (almost certainly) had already done in your previous attempts using 'other'.When you see the 'verifying......' and 'the blue ticks' you should be able to exit settings and open your mail app and then receive all your 'old' e-mails again, AND be able to SEND as well.
Excellent - thank you, ***** ***** now. It is still a mystery why the iPhones should be different, but no matter!
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