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並前往https://www.3cx.com/community/threads/custom-smtp-ssl-tls-vs-starttls.73494/

Solved - Custom SMTP: SSL/TLS vs. STARTTLS | 3CX Forums

We then did some tests with MailKit compiled locally and were able to reproduce the issue. The switch in the 3CX admin UI "Enable SSL/TLS " only ...

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