How to test email flow using SMTP commands
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Kitz - Telnet 4 Mail .::
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Test SMTP with telnet or openssl • Steven Rombauts
How to test if imap and pop mail server service is working with Telnet cmd - ☩ Walking in Light with Christ - Faith, Computing, Diary
How to use telnet to test the status of an SMTP mail server on Windows
telnet server | New Learning Site
![MS-SMTPNTLM]: SMTP Client Not Successfully Authenticating to an SMTP Server | Microsoft Docs](https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-smtpntlm/ms-smtpntlm_files/image005.png "MS-SMTPNTLM]: SMTP Client Not Successfully Authenticating to an SMTP Server | Microsoft Docs")