Do Not Unsubscribe From SPAM
Do not click the Unsubscribe/Remove me from your list links on SPAM messages. This only notifies the Spammer that your email address is a valid one and they will send you more spam. You can unsubscribe from new lists if they are from known reputable companies, but the best practice is if you are not sure don’t unsubscribe.

Do Not Buy From Spammers
Spam works and exists because it is so cheap to send an email. Since the cost of sending bulk emails to hundreds of thousands of people is so low, it pays off if only a fraction of the recipients respond. Never buy from spammers. Don't even visit their web sites or do anything else they want you to do. If there is no profit in spamming, all spammers that are in it for the money (and I bet all of them are) have an incentive to stop.

Don’t Reply to SPAM
Sometimes, spammers may post their unsolicited message to a mailing list you are on. As tempting as it may be, do not complain about the spam on the list. If you reply to spam on the list your message becomes spam, too.

Ignore Delivery Failures of Messages You Did Not Send
Viruses usually spoof the From: address so they appear to come from a friendly or even trusted source. When a virus filter blocks a message it sends a non-delivery report back to the sender or From: address. Because the From: address was spoofed the delivery failure message is sent back to someone that didn’t send it. There is little that can be done about these. If you receive a delivery failure for a message you didn’t send just ignore and delete it. If you consistently receive a large number of these contact your computer support staff and have them look at them.

Do Not Post Your Personal E-Mail Address On State’s Website
If you are an agency webmaster or information contact, do not put your personal address on your website for people to contact you. Use a secondary (Alias) address that points to your personal account. This will keep your address hidden from spammers and allow you to easily change the contact address if you begin to receive too much spam.

Do Not Post Your Address Discussion Groups or Chat Rooms on the Web.
Spammers use special programs that extract email addresses from chat rooms, web sites -- forums in particular and Usenet postings. If you must post your address you may want to post it in an obscure format that the programs don’t understand but a person can. Disguise your email address by inserting something obvious into it. If your email address is John.Doe@acme.com, modify it to read john.doe@@DELETE_THISacme.com. Obscuring your email address does make sending mail a bit more difficult. But this is not always a disadvantage.

Watch Out For Those Check Boxes
When you sign up for something on the Web, there is often some innocent-looking text at the end of the form saying something like: "YES, I want to be contacted by select third parties concerning products I might be interested in." Quite often, the checkbox next to that text is already checked and your email address will be given to you don't know who. To avoid that, look closely at every form you fill on the Web and make sure all relevant checkboxes are not ticked. Sometimes, the text will read: "NO, don't give away my email address," and the checkbox will consequently be unchecked by default. Check it.

Use Simple Clear Subjects
To protect against viruses many companies have a standard practice to not open email from users you don’t know. So use clear simple subjects on the email you send out. This has two benefits. The first is if you don’t send email to the recipient very often, the clear subject will help them recognize the purpose of the email and that it is valid. The second is simple subjects without special characters are less likely to not get blocked by a SPAM filter. Note: Blank subjects are blocked by many companies so always include a subject.