Some good advice has been given so far. As for the unsubscribe link, as mentioned above, clicking that will unsubscribe you at times. Other spammers use that link to find out if an account is active. If you click it to unsubscribe to the email, they know the account is active and will continue to spam the account with junk. Just a heads up. Best to use a spam filter as stated above.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]