Private IP Domain and Secure
Private SMTP will be given personally for every client. With private IP, your IP does not have to be blocked if one of other clients IP was blocked.
You can monitor how big the e-mail is and the destination of every email that was sent through your IP.
Spam & E-mail virus controller
Anti spam and antivirus are assigned for every incoming and outgoing email.
Send your E-mail with Encryption
Send your email with SSL 128bit, to avoid tapping.