Hi there and welcome
It appears the mail profile is corrupted.
Can you go to Settings, Mail and press on the problem email account then press delete account.
Once done, go to Settings, Mail and add the account to the phone.
If it adds it should then be able to send and receive.
Let me know the results please.
Ok, it did not say here, but it is ok, it is the exact same steps for both (they both run the same firmware).
Let me know the results please