add a way to simulate hard and soft bounces
I'm evaluating mailtrap for our outbound email testing needs. It seems like mailtrap accepts all email you send via SMTP. However in order to thoroughly test real-world scenarios, there should be a way to configure that, say, 1% of all mail will be soft-bounced, and 0.1% of all mail will be hard-bounced. Of course those number should be configurable, and even better if the user could configure specific SMTP result codes and enhanced status codes and control the percentages of each one.