Please go and check the Apple Support website and go to the Mail Settings Lookup page to validate your email settings for the mail setup.
How to set up Gmail Account on your iPhone 6s
Asked 21-Oct-2018
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How to set up Gmail Account on your iPhone 6s
1 Answer
Go to Settings->Mail, Contacts, Calendars->Add Account and then choose Google from the list of email providers. Then, to finish the Gmail account setup procedure, follow the onscreen prompts.