How do I set up an IMAP account on my iPhone?

On the iPhone, tap Settings 

Tap Mail, Contacts, Calendars. 

Tap Add Account

… and choose Other.

Click Add Mail Account

Under Incoming Mail Server settings, enter the following:

• Host Name: mail.yourdomain.com
• User Name: your full email address
• Password: the password of your email address

Under Outgoing Mail Server, enter the following:

• Host Name: mail.yourdomain.com
• User Name: your full email address
• Password: the password of your email address
• Use SSL: Off
• Authentication: Password
• Server Port 25

Your device will now ask if you want to use SSL. Select No.

Tap Save and wait for your IMAP account information to verify.