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MDaemon Free v.12.0.4
Secure POP / SMTP Windows mail server with easy webmail. MDaemon e-mail Server program for Windows is now available in a FREE 5-user license perfect for home and SOHO users wanting a reliable mail server that will grow with their business.
MintDNS Enterprise v.3.0
MintDNS Enterprise is a fully featured server suite that allows you to run your own enterprise level DDNS Server.
Test SMTP v.1.0.0
Test SMTP is a command line tool which can be used to diagnose faults with SMTP servers. This self contained tool, which should not require installation on either Windows or Linux platforms,
DNSTools v.1.0
DNSTools is a simple tool with graphic user interface to do :A Record Lookup.