Thank you so much, it's work after installed Openssl.exe.
power shell Script to get certificate "SMTP O365"
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Mohammad Al Amoudi
0
Reputation points
Hello,
I need to show Office365 SMTP certificate in power shell, I was tried below Script but get error.
"s_client -showcerts -starttls smtp -crlf -connect smtp.office365.com:587"
Please help me to do that.
Windows for business | Windows Server | User experience | PowerShell
2 answers
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MotoX80 37,596 Reputation points2023-12-03T18:47:49.8966667+00:00 What error do you get? Where did you get this "s_client" script?
Are you trying to run the Openssl application? That has nothing to do with Powershell.
https://www.misterpki.com/openssl-s-client/
I used the Digicert utility to display the cert.
https://www.digicert.com/support/tools/certificate-utility-for-windows
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Mohammad Al Amoudi 0 Reputation points
2023-12-03T18:56:47.05+00:00 I need to get SMTP certificate from Office 365 portal as an admin to add in SMTP mail service
Below the error message.
s_client: The term 's_client' is not recognized as a name of a cmdlet, function, script file, or executable program.Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
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MotoX80 37,596 Reputation points
2023-12-03T19:34:10.73+00:00 S_client is a parameter to the openssl program. Try running this.
openssl.exe s_client -showcerts -starttls smtp -crlf -connect smtp.office365.com:587If you don't have the .exe, then you will need to download it.
https://www.openssl.org/community/binaries.html
https://stackoverflow.com/questions/50625283/how-to-install-openssl-in-windows-10
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Rich Matheisen 48,116 Reputation points2023-12-03T19:40:26.4666667+00:00 I don't think "s_client" is an executable. Isn't it a command (or parameter) that instructs the openssl tool to do something.
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Mohammad Al Amoudi 0 Reputation points
2023-12-03T19:47:18.35+00:00 What can I do to get the certificate?
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Rich Matheisen 48,116 Reputation points
2023-12-03T19:48:44.78+00:00 In what directory have you installed the openssl?
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Mohammad Al Amoudi 0 Reputation points
2023-12-03T19:51:58.14+00:00 It is in O365 portal, and I want to read it.
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Rich Matheisen 48,116 Reputation points
2023-12-03T19:55:33.87+00:00 No . . . did you install the openssl tools? If you did, in which directory have they been placed?
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Rich Matheisen 48,116 Reputation points
2023-12-03T19:59:47.3366667+00:00 Then how do expect to run the openssl.exe if it isn't present on your machine???????
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Mohammad Al Amoudi 0 Reputation points
2023-12-03T20:04:26.61+00:00 What's the correct way to install it?
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Rich Matheisen 48,116 Reputation points
2023-12-03T20:23:11.91+00:00 OPENSSL doesn't provide compiled binaries. They do, however, refer you to a page where 3rd-parties offer compiled binaries for certain operating systems. https://wiki.openssl.org/index.php/Binaries
Instructions for installation should accompany the software you download.
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MotoX80 37,596 Reputation points
2023-12-03T20:58:28.0566667+00:00 Something about this question just smells wrong. You should not need to use a 3rd party tool like openssl to get connected to O365. For starters, this is not a Poweshell question. So that tag doesn't apply. You should add other relevant forum tags for O365 and Exchange to this question. Next you should explain WHY you need that certificate. How will you use it. What software are you using? Exchange? What version? Explain the big picture of the problem you are trying solve. The O365 forum experts should then be able to help you.
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