Why might attempts to send emails using code return an authentication error from AWS SES?
I thought it might be due to recent changes to the minimum TLS version. But Wireshark says that the initial "Client Hello" is using TLS1.2.
It immediately returns a fatal error that has the description "Protocol Version".
There's some other code on the server that uses a different runtime that sends emails ok and it uses the same credentials to connect.
The environment that doesn't work is .net core.