What IP or hostname do I use for ASP email components ?

To configure your mail scripts, you have to use "localhost" for the host\server setting.

Please note: Use the above instead of mail.yourdomain.com port 25 when using internal mail components. We configure SMTP on a non-routable, internal IP with an odd port number so that people can send email through ASP scripts, without having to deal with SMTP authentication issues.