I sent another test from Gmail and wrote the reason in the body: checking logs.
By then I had spent more than a week moving messages through Beatport's email system. The tests came from a work address and a personal address. They went to individual accounts, the submissions address, an external destination, a vacation responder, and a beta mailing list. I checked an IMAP connection and the queue on the mail host. A reply on October 30 finally narrowed one problem to the beta list.
The messages look absurd when they are isolated. Subjects include “test,” “another test,” “final test,” and random strings designed only to be easy to find. The bodies are not much better. Their value is in the sequence. Each one changes a sender, recipient, route, or feature while keeping the rest simple.
That is how I approached infrastructure then and now. Reduce the problem until the result tells you something. A message sent from inside the same system proves less than an outside message. A successful direct delivery does not prove a group address. A group delivery does not prove a vacation reply. A configuration that loads without an error does not prove the message reached a human inbox.
Beatport was a young online store with several kinds of email traffic. Music submissions, customer support, company communication, and automated messages did not all follow the same path. If one of those paths failed, the company could miss content or leave a customer waiting without anybody noticing from the storefront.
There was other work on the calendar. I had arranged a penetration-testing meeting during the same week and managed to miss the appointment, according to the follow-up in my inbox. The archive preserves both sides of the operating style: persistence on the mail problem and the cost of carrying too many threads at once.
October 24 was another night of checking logs. Six days later the beta list gave me a specific issue to fix. Progress was not the absence of another test. Progress was finally knowing which test should fail and why.