Not receiving replies from Craiglist

I've sent several msgs to craigslist emails (contacting sellers to let them know I'm interested) but receiving no replies. I think the spam filter is catching these replies to me, but I can't be sure. Can the SCRYPTmail admins confirm if spam filtering automatically grabs such emails? They typically have the following form:

xyz-1234567890@sale.craigslist.org

Hi BakerBaker, try emailing the question to support@scryptmail.com. Sergei has not been on here in a couple months.