How to Install and Configure SMTP Server on Windows Server 2016/2012 R2? | Windows OS Hub
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MultiMail 2.0 - Freeware SMTP stress testing tool - CodeProject
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GitHub - CodeCowboyOrg/SimpleSMTPClient: Simple SMTP Windows Client for Testing SMTP Server
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GitHub - georgjf/SMTPtool: A slim .NET based UI tool to communicate with SMTP servers and to quickly compose, mail and remail messages
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