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Set up email on iPhone
Connect your business mailbox to Mail.
Mailbox settings
Find the email service details in the panel: full address, mailbox password and incoming/outgoing hostnames.
New Mail account
In Settings, go to Apps → Mail → Mail Accounts → Add Account. Enter the address and choose another mail account for manual setup. Labels vary by iOS version.
Choose IMAP
Enter your name, full email and the assigned IMAP/SMTP settings. Authenticate outgoing mail too. Check the secure ports in the account settings.
Save and test
Save after connection verification. Test receiving and sending with another account you control. If an error appears, keep its exact text for support.
Reference: Apple Support