The tricks of spammers are many and subtle. And I’m not always sure what their game is.
I was selling something on CraigsList recently. One of the inquiries I received asked me to e-mail the person’s personal e-mail, included in the mail message, directly (rather than hitting Reply); this was ostensibly to keep scammers and bots out. A bit odd, maybe, but somewhat plausible (at least in a misestimating-computer-capabilities kind of way), and CraigsList interactions are full of communications behavior that seems odd to me. I sold the item to someone else, but to close all my open loops on it, I e-mailed the address they specified to tell them that the item had been sold.
Big mistake. Since then, I’ve gotten at least a dozen e-mails, all with the same subject as that mail I sent and similar text about being interested in or attracted to me and my ad, asking me to sign up on a particular site (no fee, of course!) to send a private message. Occasionally, a picture is attached.
I’m not entirely sure what the game is with this. Phishing? Malware installation? Getting credit card info? I haven’t visited any of the linked sites, so I don’t know. But it’s yet another “spammers are doing what? and why?" moment.