Exchange 2019 SMTP Help

Brandon Hoskins 0 Reputation points
2023-03-18T20:14:33.29+00:00

Good Afternoon All,

I have a new Exchange 2019 install and have installed my certificate I got from an external CA. I can get POP3 to work for incoming mail and outgoing SMTP when using STARTTLS but I want to use SSL/TLS for the SMTP. However, when I select with port 587 or 465 I get the following error:

Send test email message: Your server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mail server administrator or Internet service provider (ISP) for additional assistance.

I have confirmed that my client machine of Windows 11 is using TLS 1.2 and Exchange 2019 is using TLS 1.2 as well. Does anyone know how to fix this?

Thanks

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  1. Amit Singh 4,846 Reputation points
    2023-03-20T08:43:44.0866667+00:00
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  2. Jame Xu-MSFT 4,166 Reputation points
    2023-03-20T09:18:38.1666667+00:00

    Hi @Brandon Hoskins ,

    You could refer to this article: https://woshub.com/outlook-server-not-support-connection-encryption-type/

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