SMTP Test from PowerShell
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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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GitHub - CodeCowboyOrg/SimpleSMTPClient: Simple SMTP Windows Client for Testing SMTP Server
Testing SMTP Relay Server Connection Issues Without Using Telnet
SMTP Server Settings
Test Mail Server Tool
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Portable SMTP Tester 1.0.1 (Windows) - Download & Review
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How to Test an SMTP Server with Telnet. Step-by-Step Tutorial
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Step 1. Configure SMTP Server Settings - Veeam ONE Monitoring Guide
Test SMTP connection and send test email
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