1. Using ALL CAPS in emails.
2. Don't put a useful signature in email. e.g., name, job title, phone #, etc.
3. Use overly lengthy disclaimers
4. Ridiculous out-of-office messages.
5. Advertise your cell provider or email provider "This message sent from my Verizon Wireless Blackberry" or "You can watch movies at Yahoo.com"
6. Use lengthy CC lists instead of BCC.
7. Forget that anything sent over email can never, ever, be truly deleted. - Morgan Stanley emails, etc.
8. Use Gmail - ECPA provisions, David Airey domain hijack, and Gmail contacts XSS hack.
9. Rely solely on online tools. It was just a few years ago when some woman who ran some sort of sewing club had her e-mail account killed by one of the big e-mail companies, such as Hotmail or Yahoo!. She sent something to the site's club via a mailing list, and, apparently, the service identified her as a spammer. Her lament was that her e-mail address was no longer valid, and it was the only address that all the club members knew. There was no mechanism for recourse, and she could not contact anyone because she kept the mailing list on the hosting site.
10. Use Yahoo, Aol or Hotmail addresses - especially ones that don't establish a relationship between the person and the address.

Tips & tragedies of eNetworking
What is eNetworking?
Using websites or emails to network with people - e.g. Fredslist, Yahoo Groups, LinkedIn, MySpace, Facebook, etc.

What's great about them?
A) Allow you to meet people across a wide geography. Good sites also let you create relationships using primary and secondary contacts.

B) It's easy to email 10,20,3000 people in a day. Not so easy to meet them all in person.

C) They are self-recording and form a perpetual memory bank. Once you create a relationship or join a group, it's there for your review and use. Dropping or or getting kicked out requires significant effort.

What's bad about eNetworking?
A) Makes people lazy. Most people transfer what works for them in face-to-face meetings or their office to the ecommunity. That does not usually work - the etiquette, needs and desires are different.
B) Easy to become a lurker - someone who reads, scans or browses, but never really participates. Networking is NOT a spectator sport!

C) Kids today have no idea how badly they could be screwing up their lives because digital memory is indelible - - Harvard student denied job interview due to facebook posting, - intern busted for going to Halloween party, when he called in sick, due to MySpace/facebook pictures, - MySpace slut trolling, - LI Perfume couple jailed for keeping servants as slaves - daughter's facebook pages reveal their lifestyle
Why is this bad? Kids today WILL be your employees and networking resources tomorrow.

D) The internet never forgets - that angry/dump response, the crude efforts at humor, the accidentally CC'd personal email will stay around forever. See "Googling your privacy away"