[Lazarus] Email sending program using Indy stopped working - seems to be an SSL problem

[Bo Berglund]

I wrote a commit reporting application for Windows Server16 back in 2018 using
then current Lazarus/Fpc.
It is a command line program called from a hook in subversion to distribute the
log message and details of commits among co-workers.

It uses Indy 10.6.2 to do its job.
The mailer class has these in uses:
  {Indy units:}
  IdSMTP,
  IdMessage,
  IdEMailAddress,
  IdIOHandler,
  IdIOHandlerSocket,
  IdIOHandlerStack,
  IdSSL,
  IdSSLOpenSSL,
  IdExplicitTLSClientServerBase,
  IdMessageBuilder,

Back mid-december 2023 the emails stopped arriving but the problem was not
discovered/reported until I myself recently did a commit and I did not get the
expected log message email...

Now I have looked in the logfiles the application creates and found this error
example:

20240111 17:13:35.343 Connecting to mailserver
20240111 17:13:36.590 EXCEPTION: In SendSvnMessage = Error connecting with SSL.
error:1409442E:SSL routines:ssl3_read_bytes:tlsv1 alert protocol version

Can someone please advice:
- Is there an external (dll?) file on Windows Server 2016 might need to be
updated for ssl to work in email handling using Indy10 with SSL?

- Where should I look for that file?

- Or is there a different solution to the problem?

My development system is a Windows 10 x64 PC...


-- 
Bo Berglund
Developer in Sweden