Error (0x80042109): Outlook cannot connect to your outgoing (SMTP) e-mail server. | Web Hosting Forum - Review - Community & Resources
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authentication failure [SMTP: STARTTLS failed (code: 220, response: 2.0.0 SMTP server ready)] · Issue #5392 · osTicket/osTicket · GitHub
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powershell - How to fix 'the SMTP server requires a secure connection or the client was not authenticated' error when the server response was 5.7.0? - Stack Overflow
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SQL SERVER - Database Mail Error: The SMTP Server Requires a Secure Connection or the Client was not Authenticated. The Server Response Was: 5.5.1 - SQL Authority with Pinal Dave
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