Outgoing mail server for Email hosed on ok computer (SITEHOST)
  SMTP Server = mx1.sitehost.co.nz 
  Port = 465 
  Username = the full email address, e.g. person@example.co.nz 
Password = as supplied to you.
Please note:
- the username and password will be exactly the same as the settings for your incoming mail.
- Ensure your mail client is configured to use authentication on outbound mail. You can normally tick: Use same as incoming.
- Ensure that you have configured your email software to use SSL (accept all certificates) in the account settings.