I'm not sure about mail signatures that expressly state blogability, though that sounds like a good idea, and I don't agree with the wedding invitation rule, but I'm not very formal when it comes to weddings, otherwise I think these are all good rules.
Do: Use proper grammar, punctuation and spelling in e-mails and other forms of electronic correspondence. Don't treat your devices as if they're more important than people. Be aware of online subcultures (IRC chatrooms will function differently according to topic). Talk quietly when on your cell phone in public If you must take a call during a meeting and it will last more than 30 seconds, excuse yourself from the table. Attach a note in your e-mail signature file saying whether the contents are bloggable. Put contact information, including a phone number if it's a business correspondence, in your e-mail's signature file. Don't: Don't leave your cell phone turned on in meetings, movies, museums, job interviews, worship services, funerals, etc. (exceptions are allowed, but always put your phone on vibrate, warn hosts or companions and, if in a movie theatre [sic], try to sit in an aisle seat). Don't read and respond to e-mail on any device during a meeting or a meal. Don't send e-mail that does not use conventional grammar, such as upper and lower-case letters in the appropriate places. Don't send wedding invitations via e-mail. On the corporate side, never fire people via e-mail. Don't watch risqué movies on your portable DVD player while in public. Don't send any sort of electronic missive that you would like to keep secret. Don't open attachments without being sure you want them.
Do:
Use proper grammar, punctuation and spelling in e-mails and other forms of electronic correspondence. Don't treat your devices as if they're more important than people. Be aware of online subcultures (IRC chatrooms will function differently according to topic). Talk quietly when on your cell phone in public If you must take a call during a meeting and it will last more than 30 seconds, excuse yourself from the table. Attach a note in your e-mail signature file saying whether the contents are bloggable. Put contact information, including a phone number if it's a business correspondence, in your e-mail's signature file. Don't: Don't leave your cell phone turned on in meetings, movies, museums, job interviews, worship services, funerals, etc. (exceptions are allowed, but always put your phone on vibrate, warn hosts or companions and, if in a movie theatre [sic], try to sit in an aisle seat). Don't read and respond to e-mail on any device during a meeting or a meal. Don't send e-mail that does not use conventional grammar, such as upper and lower-case letters in the appropriate places. Don't send wedding invitations via e-mail. On the corporate side, never fire people via e-mail. Don't watch risqué movies on your portable DVD player while in public. Don't send any sort of electronic missive that you would like to keep secret. Don't open attachments without being sure you want them.
Don't:
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Anyone have any more?
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Disclaimer The opinions expressed herein are my own personal opinions.