Format your text on less than 80 columns. Do not include attachments in proprietary format. Do not keep unnecessary quoted text in your replies. Use a mail client which sends out threading information . If a mailing list is related to your question, use it instead of writing directly to me.
Some people receive a lot of emails.
I can receive every month up to 10,000 emails, and I imagine that some people receive a lot more emails than I do. Of course, not all of the 10,000 emails are addressed to me directly. A rough estimation would be that 2,000 emails require my attention and 600 of them need a reply. I wrote this for two reasons. First, I would like people to use email correctly so that I can save some time.