Because I'm an author, I probably get more email than the average person, so I see more spam too. I've learned the patterns people use and this helps me avoid it most of the time. These lines: "check this out" "look at this amazing site" "is this really you in these pictures?" "your ex is saying bad things about you here" are often scams.
When I hold a contest, I can't send the person who wins an email that says "Winner!" in the subject, because their spam service will throw it straight into the junk pile. I have to think about my posts and try to word them in such a way that they get past the junk mail and reach the person who entered.
Despite our best intentions, sometimes email goes to spam for reasons that we don't understand. I had two separate offers for book contracts end up in my spam folder. I check that folder before I dump it because of that. At least once or twice a week, something ends up in spam that shouldn't be there.
Yahoo, Rocketmail, Hotmail, MSN, and most other email services will flag an email that contains only a link as spam, so whenever you post, do include something about the site, and include your name. Spammers always go for the easiest route to produce lots of messages, so they don't bother to sign most of them.
There are exceptions of course. Have you ever gotten an email from a friend saying that she's in a foreign country, has had her purse stolen, or that she's been jailed for a crime she didn't commit and desperately needs your help to raise cash? Chances are, she's home, sitting in the living room, and is clueless that her email account has just been hacked. It can happen to anyone (and did to me last May). If you get an email like this, first, don't believe it. Second, contact your friend by a different method and alert her. Third, don't believe it. (Yes, I repeated that) ^_^
Protecting yourself online is important. Never click on a link that appears by itself, with no information about its meaning, who sent it, or what it's about. You can be setting yourself up for a scam, or to be hit by malware that downloads itself when you click the link. One of the biggest going around right now looks like it's from Amazon, and says it's a cancelation.
To tell where a link is going, point to it with your cursor, and look at the bottom of your screen. In your browser, the place where the link will take you usually shows up in the lower left margin. If the link says it's one place, but the URL shows somewhere else, don't click it. It's a scam.
Ever been scammed or had your account hacked? What did you do?