Unfortunately, each of these systems is highly complex and can inflict all kinds of damage on data, much of the damage undetectable to humans.

Email addresses sometimes get reassigned to a different person. For example, employment changes at a company can cause an address used for an ex-employee to be assigned to a new employee, or a mail service provider (MSP) might expire an account and then let someone else register for the local-part that was previously used. Those who sent mail to the previous owner of an address might not know that it has been reassigned. This can lead to the sending of email to the correct address but the wrong recipient. This situation is of particular concern with transactional mail related to purchases, online accounts, and the like.

I’m going to add the API Server as an actor to my first test sequence to give some granularity as to what I’m actually testing.

Part of why most code -- and most software -- sucks so much is that making sweeping changes is hard.

Why