Can I Run an Email Server Using a Free No-IP Hostname?

Yes, but most ISPs (Internet Service Providers) block port 25 (mail port) both inbound and outbound. You will need No-IP Reflector to help you get around your ISP for inbound mail and No-IP Alternate-port SMTP can help with outbound email.

If you’d like to use your free hostname with a mail service, we currently provide at least a single MX record under any No-IP hostname. Enter the hostname of your email server in the external mail exchanger field (MX Record) when modifying the host that you wish to accept mail.