smtp without authentication

Sometimes old softwares or very simple applications
do not allow to issue a secure authentication as RealSender requires.

The solution is to provide an open a port to go through the smtp server,
checking only the connection’s ip address and the sender’s email address.

In this way you’ll be able to send your email messages without authentication,
but you will always be allowed to authenticate whenever possible.

RealSender partners and large organizations
can independently update the list of authorized IPs.