[dingaling]

> occasionally a comprehensive reply requires an essay, or the equivalent.

Use a bulleted list or a diagram.

One of the worst e-mails I ever saw was about lifecycle of a token for PCI compliance, just a solid screen of words. My colleague who received it sat for an entire afternoon to parse it and drew a UML activity diagram from it, which he sent back to the mailing list to rapturous thanks. The original sender received only scorn, even though the was the 'authority' on the issue.