Change email ports on an iPhone

1. From the Home screen, choose Settings:
   
   
   
2. Next, tap Mail, Contacts, Calendars:
   
   
   
3. In the Accounts section, tap Add Account..... :
   
   
   
4. Choose your email account type. For setting up email to work with your CDG hosted service, choose Other.
   
   
   
5. Select Add Mail Account under the Mail section:
   
   
   
6. Enter your name and email address. Then tap Next:
   
   
   
7. Make sure to enter your information, see figure below. The iPhone indicates these fields as optional but they are not.
   
   
   
8. On the next screen, enter your account details.
   
   
   

• Incoming Mail Server
  Host Name: mail.4cdg.com
  User Name:thatguy@example.com
  Password: If you do not know your password, .
  
  
• Outgoing Mail Server (SMTP)
  Host Name mail.4cdg.com
  User Name: thatguy@example.com
  Password: If you do not know your password, .

9. Tap Save to save the entered information. Your iPhone will then verify your account information.
   
   
10. Upon successful completion, you will be taken back to the Mail screen. Your account will now be listed. For this example, note That Guy's Email is listed under Accounts:
    
    
    
11. You will still need to configure your folders since you are using POP. Select your newly created account and enter the Advanced section: 
    Change your POP Path Prefix from / to INBOX:
    
    
12. Now, you will be able to choose the Drafts, Sent, and Deleted folders on the server. This way your folders will be in sync no matter where or how you access your email. Just choose each Mailbox on the same Advanced screen and select the matching folder on the server