- What happens when webmail.allmyurl.com is opened?
- Do you have a routing entry in your nameserver to webmail.allmyurl.com?
- Have you selected one of the webmail programs from the email configuration page of your domain or is that set to "none"?
Have you verified that port 25 is open in your firewall and possibly a firewall before your server (at your provider)? Some providers have that closed by default for outgoing mail.