User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0 Build ID: 20180605171542 Steps to reproduce: Using v52.8.0 (32-bit) of Thunderbird Setup mail account using both POP3 server on Port 995 and SMTP server on Port 465. And set Authentication to either SSL/TLS or STARTTLS with Normal Password Actual results: Logs show that authentication/connection is occuring in PLAIN text and username and password are exposed. See attached log files, using SSL/TLS Authentication setting. Expected results: I have an expectation that when I set Authentication to use SSL/TLS or STARTTLS that this will occur securely and not in plain text. There should be either (1) no fallback allowed to PLAIN text authentication when SSL/TLS or STARTTLS are choosen, or (2) there should be an option with prompt asking to confirm whether or not to continue with PLAIN text authentication when secure authentication fails.
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