Step 1:From a Home screen of your phone device, touch and swipe up to display all apps.
Step 2:Navigate to Settings and choose ‘Accounts Users’ under accounts icon.
Step 3: Now tap an email account type as IMAP.
Step 4: Click on ‘Account settings’ link and add the new account with below details
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Account name
Your name
Email address : Your email address
Username : Your email address
Password : Email account password
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Step 5: Now enter the below necessary details for Incoming settings and Outgoing settings on your mobile device’s email client.
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Email Address: Your complete email address
Username: Your complete email address
Password: Your email address password
IMAP server: Hostname
Port: 993
Security type: SSL or SSL/TLS
Authentication Method: Auto
SMTP server: Hostname
Port: 465
Security type: SSL or SSL/TLS
Authentication Method: Auto
Require sign-in: Must be checked
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Step 6: Once you are done, kindly verify whether all the existing emails are started downloading on your mobile or not.