Friday, 03 June 2022
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I have downloaded compiled modified esegece INDY version and replace original indy 10.6 . After copiling my app I have situation that SMTP sending email to office365 server is working on WIN10 , but not on WIN 7 . I checked WIN 7 computer on "" website and TLS 1.3 is supported. The error my D7 program is showing is "EIdSMTPReplyError exception message : TLS 1.0 and 1.1 are not supported by your organization. Please contact your administrator. []."

I put OPENSSL 1.1.1 and 3.0.3. dlls in exe directory.
Any idea what I'm doing wrong??
1 year ago

The free Indy version only supports openSSL 1.1.1, openSSL 3.0 is only supported with a newer Indy version and is only available for Enterprise customers.
I think that if you open it tests the web-browser connection, not your indy SMTP application.
The error means the client is trying to connect using a old TLS protocol which is not supported by the server, maybe the application is misconfigured, is still pointing to old Indy version, the openssl libraries are not updated...

Kind Regards,
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