One of many reasons I don't have much confidence in craigslist. Another thing I would caution people about is their privacy.. MANY people even after they have left craigs list report their spam has doubled, even tripled, that is because of their search bot's.. if you post an ad for example about doing medical billing, you will find your inbox inundated with emails about medical billing and any other relative thing, they take your ad's and use the keywords and categories and let third party's have access (and I don't care if they say they don't..they do!) Ebay does it to, so does paypal (paypal is the worst!!)
If you really want to use craigslist, I recommend an email address ONLY for use with craigslist. IMO I also would not link them to any website in your ad, instead put in your ad: References and additional company information available upon request.
JMO!