Tls parameters in imap/smpt sessions

Our mail server accepts requests with a certain set of cipher suites, extensions, EllipticCurves,EllipticCurvePointFormats. And if cipher suites is set by the parameter mail.smtp.ssl.ciphersuites (at least in java mail), it is not clear with the other parameters. And I tried to change ciphersuites in jakarta.mail, it didn't work.

```
String cipherSuites = "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,...";
props.put("mail.smtp.ssl.ciphersuites", cipherSuites);
```

And so the question:

How in imap/smpt connection do I replace:
1. cipher suites
2. extensions
3. EllipticCurves
4. EllipticCurvePointFormats

The report points to IMAP/SMTP TLS setup and the mail.smtp.ssl.ciphersuites property, but names no source file or test. Start by locating the existing TLS-property handling and related tests, then establish the supported configuration for cipher suites, extensions, EllipticCurves, and EllipticCurvePointFormats. Done requires a clearly agreed scope covering all four settings.

Written by the indexing model from the issue text.