[Mailer][Postmark][Webhook] Fix webhook testing in dockerized setups #53869
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Adding "127.0.0.1" to webhooks doesn't always cut it. Testing in e.g. dockerized setups the IP address will most certainly not be 127.0.0.1 when testing requests originate from the host.
I wasn't sure whether this is a bug or a feature. For us it's a bug (we cannot test webhooks here, if "test" means testing in our development environment). On the other hand, it could also be a feature (and "127.0.0.1" removed completely), if by "testing" only the Symfony tests were meant.
What do you think? Bug? Feature?