Emailing Wizard

In his blog entry, "8 things I wish everyone knew about email" Seth Godin gives a few hints on how to properly use email. I thought these four were probably the most necessary for the emailing lot to know.

1. You can't recall an email you didn't mean to send. Some software makes you think you can, but you can't. Not reliably.
2. Email lives forever, is easy to spread and can easily show up in discovery for a lawsuit.
3. Please don't ask me to save a tree by not printing your email. It doesn't work, it just annoys the trees.
4. Send yourself some email at a friend's computer. Read it. Are the fonts too big or too small? Does it look like a standard email? If it doesn't look like a standard, does this deviation help you or hurt you? Sometimes, fitting in makes sense, no?