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Couldn't connect to host, port: smtp.qq.com, 25; timeout -1
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Could not connect to SMTP host: smtp.qq.com, port: 465, response: -1 SpringBoot发送邮件
阿里云服务器发送邮件：Connection could not be established with host smtp.qq.com [Connection timed out #110]
python使用smtplib库和smtp.qq.com邮件服务器发送邮件
MailConnectException: Couldn't connect to host, port: smtp.163.com , 465; timeout -1;
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springboot Got bad greeting from SMTP host: smtp.qq.com, port: 465, response: [EOF]
got bad greeting from host "smtp.qq.com", port: 465, response: [EOF]
通过QQ邮箱的SMTP服务器发送QQ邮件至163邮箱提示“发送邮件失败”的解决方案（三种可能性，不妨一试）