Saying goodbye to your former co-workers with a mass e-mail is becoming a bit of an art form.
Sending off an e-mail while full of emotions after just losing your job, for instance, can lead to a nasty letter that could burn some bridges. A lighthearted, funny tone can offend some people. A short, workmanlike note can bore readers and make them hit the "delete" button fast.
It all starts with what your workplace environment is.