Let's Put Some Humanity Into E-mail - A few guidelines on the practice of good manners and courtesy. - http://www.usatoday.com/news/opinion/columnists/baldrige/manners1.htm
Do Not Send HTML Emails - Reasons not to use HTML emails. - http://www.vexen.co.uk/notes/htmlemails.html
Towards an Ethics and Etiquette for Electronic Mail - Gives a general introduction to e-mail, and then offers guidelines for sending, receiving, and replying to messages. - http://www.rand.org/pubs/reports/R3283/index.html
Configuring Mail Clients to Send Plain ASCII Text - Six main reasons for not sending HTML or MIME messages, and directions to turn off HTML and MIME in mailers. - http://www.expita.com/nomime.html
Netiquette No Nos - Six things not to do when sending email. - http://www.georgedillon.com/web/netiquette.shtml
Gullibility Virus Warning - A spoof intended to educate new Internet users about thinking before forwarding virus hoaxes and urban legends. - http://www.virtualsalt.com/warning.htm
Online Netiquette Uncensored - Provides blunt suggestions for correct online communications, especially in reference to e-mail. - http://www.onlinenetiquette.com
How To: Send A Proper E-mail - Gives several suggestions on how to format and compose a message. - http://www.askmen.com/fashion/how_to/1_how_to.html
E-mail Etiquette - Provides guidelines dealing with quoting, smilies, salutations, digital signatures, privacy, abbreviations, flaming, and newsgroups. - http://www.iwillfollow.com/email.htm
About Netiquette - Gives advice on manners and formatting in electronic communications, with an emphasis on email. - http://songweaver.com/netiquette.html
Dynamoo's Email Etiquette - Offers a list of "Do's" and "Don'ts" to help e-mail users avoid basic mistakes. - http://www.dynamoo.com/technical/etiquette.htm
Electronic Mail Etiquette - Discusses the proper way in which to format and compose a message, as well as some suggestions regarding courtesy and emoticons. - http://www.cs.queensu.ca/FAQs/email/etiquette.html