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SPIZD stands for Stress Probing Invasive Zap Destructor; it's a command-line stress test tool used to determine how many simultaneous (concurrent) connections servers can handle. Protocols: http, pop3, pop3s, imap, imaps, smtp, smtps, ssh, radius.
SmtpUnit is a smtp server written in java to be used for unit testing java code within a enterprise level or stand alone java application to test code that results in an email being sent.