I've posted a couple of ads on Craigslist under Services Offered for my freelance writing website. (Link in profile, if interested) Almost immediately I started getting SPAM messages asking me if I found a job yet. Same text, different e-mails, all generating from gmail. No link to click - just an 'e-mail me back' ending to the message. Does this happen to anybody else when you post there?
Craigs is a mecca of spam on both the front end and the back end. A friend of mine replied to a job posting and got so much virus laden spam back that he had to wipe his computer clean and reload everything. When they finally go to full phone verification with a credit card requirement then they may be able to clean it up. Until then it's a cesspool for the naive.