Make sure that your iPhone is running the latest software. Sync your iPhone to iTunes and look for "Your iPhone software is up to date." If you see "A newer version of the iPhone software is available", then click the update button and follow the instructions to update your software.

Tap to open the Settings App.

Tap on "Mail, Contacts, Calendars."

Tap "Add Account..."

Choose Microsoft Exchange as the account type.

Enter your information and then tap on the "Next" button. Your Email will be firstname_lastname@nsmail.asun.edu.

Enter the server name: hercules2.asun.edu. Tap the "Next" button.

If you get "Unable to Verify Certificate" dialog, choose "Accept."

Tap the "Done" button.

Your ASUN email should work now. However by default the account is set to only retrieve email from the last 3 days. You may want to go back into the account settings and set it to retrieve more than 3 days worth.