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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
MultiMail 2.0 - Freeware SMTP stress testing tool - CodeProject
SMTP Mail Sender - Portable SMTP mailer
Just launched! World's best SMTP server testing tool.
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13 SMTP Tools to Diagnose and Test Email Security
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SMTP Test from PowerShell
Test SMTP connection and send test email
How to Install and Configure SMTP Server on Windows Server 2016/2012 R2? | Windows OS Hub
SMTP Test from PowerShell
How to test mail server SMTP connection by telnet at OS (unix) for SCOT config. | SAP Blogs
Fake SMTP server! Great for testing email / SMTP! – Superhero Ninja
Configuring email server settings
