Used SMTPTool for Windows?
Developer’s Description
SMTPTool allows you to easily connect to a SMTP server and send commands to it, without using an inconvenient command line telnet client.
This is useful for system administrators, who encountered problems with an e-mail client (or a POP3 connector in MS Exchange and the like) and want to interact with a SMTP server themselves, to find the problem. SMTPTool also allows you to record the commands you have sent, and to replay them. No installation required to run this program. Version 1.7 includes unspecified updates.
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