To add your corporate email account to your iOS device:

1. Settings → Mail → Accounts → Add Account → Other → Add Mail Account.
2. Enter your name, email, and password, then tap Next.
3. On the IMAP tab:

Note: When prompted "Cannot connect using SSL. Do you want to try setting up the account without SSL?", tap Yes. Be sure to fill in the username and password fields for the outgoing server.