Spam Resource: I got a bounce! What do I do?

Al Iverson just released a new brilliant post on Spam Resource:

So you’ve seen a new bounce message and you’re wondering how best to handle it. Where do you start? How do you troubleshoot it? I’d love to write a whole book on the topic, but alas, that’ll take some time. In the meantime, here’s what to do:Here’s the very short and abbreviated version of what you should do:READ THE BOUNCE MESSAGE. It’ll contain text. That text will almost always contain an English language description of why the ISP rejected the email message. That message may be cryptic, but it’s VERY insightful, if you can decode it.Trust the bounce message. Bounce messages should be considered correct until proven otherwise. For example: if you get a bounce message from Gmail that says your mail is bouncing because of a lack of email authentication — lean hard into that. Investigate. Test. Prove that authentication is working. Because it’s probably not. Yes, sometimes an ISP

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