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Can't use Office365 SMTP Server to send email

I have Office 365 subscription and its STMP Server is ‘’, port: 587

While I have configured my email settings and tried to send a test mail, Testrail Server always notify me below message:

「Sending the test email failed. Please see the following messages and server output for details:

The SMTP connection failed to start [ssl://]: fsockopen returned Error Number 13 and Error String ‘Permission denied’」

Can anyone help me out, please?