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Mail Server Pro is a bullet-proof SMTP POP3 server software used by corporations and Internet Service Providers as an ultra fast and reliable mail server. It is simple but powerful; it has a lot of security features and options to prevent DDoS attacks and block SPAM. The SMTP and POP3 services work as NT services therefore they will keep working in the logoff mode. For software debugging and testing purposes, the program has a testing mode you can use to check if your email clients work correctly. It is also ideal for laptop PC users who travel a lot and have to use different Internet Service Providers (ISP) on the run. Using Mail Server Pro, you will never encounter a sending problem wherever you connect your PC to a network or phone socket. If the program can not deliver your email message directly, it will deliver it through SMTP gateway servers. You can maintain an unlimited number of SMTP gateway servers to achieve the best delivery rate.