Step 1: Open Outlook and select File.
Step 2: Check Manual setup or additional server types and click Next.
Step 3: Select IMAP and click Next

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Account Type: Select IMAP
Incoming: mail.domain.com   (or)  hostname
Outgoing: mail.domain.com    (or)  hostname

Select IMAP after the Incoming mail server name.
User Name: Enter in the full email address
Password: Enter in the password for that specific email address
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Note: Use your domain name in domain.com field

Step 4: Click More Settings.
Step 5: Select Outgoing Server and check My outgoing server (SMTP) requires authentication.
Step 6: Select Outgoing Server
Step 7: Select Advanced.

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Enter the below details
For IMAP use 143 - SSL Disabled      ( If SSL enabled Use 993)
Outgoing SMTP port - 25 or 587 or 26 ( If SSL enabled use 465)
For Root folder path enter INBOX with uppercase letters.
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Step 8: Click “Next†and then click “Finish†to complete the email account setup.