Not Solved [Error Message] Failed to start TLS encryption, Office 365 SMTP - It worked but not any more
#3
Not Solved
(2021-01-19, 04:55 PM)Crazycat Wrote: Have an eye on https://github.com/PHPMailer/PHPMailer/issues/1309

I've tried running:

echo QUIT | openssl s_client -crlf -starttls smtp -connect smtp.office365.com:587

Assuming that not including the -CAfile and path will force the command to use the system certificates. The command returns:

CONNECTED(00000003)
depth=2 C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA
verify return:1
depth=1 C = BE, O = GlobalSign nv-sa, CN = GlobalSign Organization Validation CA - SHA256 - G3
verify return:1
depth=0 C = US, ST = Washington, L = Redmond, O = Microsoft Corporation, CN = outlook.com
verify return:1
---
Certificate chain
 0 s:/C=US/ST=Washington/L=Redmond/O=Microsoft Corporation/CN=outlook.com
   i:/C=BE/O=GlobalSign nv-sa/CN=GlobalSign Organization Validation CA - SHA256 - G3
 1 s:/C=BE/O=GlobalSign nv-sa/CN=GlobalSign Organization Validation CA - SHA256 - G3
   i:/C=BE/O=GlobalSign nv-sa/OU=Root CA/CN=GlobalSign Root CA

Which from what I understand, this means that it is working as it should.
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RE: Failed to start TLS encryption, Office 365 SMTP - It worked but not any more - by jft-aml - 2021-01-20, 09:56 AM

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