Add your mail account
Tap Settings
Move down and tap Mail, Contacts, Calendars
Tap Add Account
Tap Other
Select Add Mail Account.
Enter your Name.
Enter your Email e.g. hello@example.com (being your domain)
Password is the password that you selected for the email account in the Control Panel.
Enter a Description e.g. hello@example.com
Tap Next.
Highlight the IMAP tab.
For Incoming Mail Server enter imap.example.com as Host Name or mail.example.com (example.com is your domain)
Enter your full email address as User Name e.g. hello@example.com.
Enter your Password that you selected for the email account in the Control Panel.
For Outgoing Mail Server enter mail.example.com as Host Name. (example.com is your domain)
Enter your full email address as User Name e.g. hello@example.com.
Enter your Password that you created in the Control Panel.
Please note that even though the field says Optional you need to fill it out.
Tap Next.
Tap Save.
Synchronize folders with server
The next step is to synchronize Mailbox Behaviors with the server, to make sure that your mails are saved both on the device and on the server.
Tap the mail account you just added.
Tap your account again.
Tap Advanced.
Tap Draft Mailbox and select Drafts.
Tap Sent Mailbox and select Sent.
Tap Deleted Mailbox and select Trash.
To complete the setup, tap Account and Done.
Congratulations, you have successfully set up your One.com mail account on your iOS device.