Scripting – Powershell Script Alternative to Telnet SMTP Connection test – Griffon's IT Library
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our customer can telnet port 25 only one permission | Email Security.cloud
Using Telnet to test Exchange SMTP
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Infrastructure Hacking: Telnet Protocol » Hacking Lethani
ExchangeInbox.com - Telnet Port 25
5 Ways to Check if a Port Is Opened - wikiHow
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Test SMTP connection with telnet PowerShell script - ALI TAJRAN
