1) If sending to large groups of people, list them in the "BCC" field so we don't have 100 lines of addresses and 5 lines of substance.
2) Don't sign petitions through the email. If you send it to 20 people, you don't get 20 more signatures on the petition, you get 20 new versions of the petition. When they send it to 20 more people, you then have 400 new versions of the petition. Make a website and have everyone sign in one.
3) If someone is offering money, they're not. Check their website, it probably has something like "there's been an email going around that we're giving out money, but we're not." Example
4) If you send the email to less than 5 people, you will not go to hell. You love Jesus, you just don't like to guilt trip people. It's okay.