TYPO3 Core

The Symfonie mailer allows to configure serveral options, like the "TLS Peer Verification" (https://symfony.com/doc/current/mailer.html#tls-peer-verification):

By default, SMTP transports perform TLS peer verification. This behavior is configurable with the verify_peer option. Although it's not recommended to disable this verification for security reasons, it can be useful while developing the application or when using a self-signed certificate:

$dsn = 'smtp://user:pass@smtp.example.com?verify_peer=0';

It would be nice, if this and other options could be configured in TYPO3 as well.