* Use a few bullet points to put attention on the main points you want to convey.
* Without going overboard, use a tasteful amount of graphic design (bolding one key sentence or whatever).
* Break up a giant nuanced email into sections.
* If something is critical, make it visual: a picture, explainer video, or an infographic can be really useful for something key.
This is harder than it looks. A quote attributed to Mark Twain is "I didn't have time to write a short letter, so I wrote a long one instead." It's a lot easier to go overboard than to distill what needs to be conveyed into the core elements.
Hell, I've learned not to ask more than one question in an email. The first one is the only one to get answered.
I had this recently with something I wanted to order online. I asked two questions, the second was answered, the first was ignored. So I had to send a second email to ask the first question again.
I'm really curious if it's a symptom of limited modern attention spans, or if you'd find the same issue in vintage hand-written letters.
1. People tend to skim and a question could be lost even in a two-sentence paragraph.
2. Email's structure means people tend to reply "at the tip" and branching conversations are difficult to understand.
Contributing to this latter problem are:
a. SMTP (to/cc are too flexible, each message is it's own "thing")
b. POP (deep conversations are just a stack of messages some people may not have the "original" and can't easily reply higher up the tree without breaking client threading)
c. Email client visualization of message threads are generally bad. I haven't seen a single client do this well. Outlook can, but out of the box has a very "flat" view.
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So, people tend to read at the bottom and if someone missed something early in a thread you have no chance of getting it addressed a few messages in.
IMO something more akin to newsgroups or even reddit/HN tree-view threads could be a better fit for business discussions, but I haven't seen anybody try it.