Craiglist filter avoit way

Dear My project budget only $200 we face more problem Sending mail in craiglist. when I am sent mail in my own posting project in craiglist then I see that's mail not received. I am sending 1 yahoo account to high 20 mail but as a same problem. Ip changer to I am change my own ip addres but same problem. I need right Solution who give me that's clear way & 100% result for sending mail? I am agree give you $200 for that for your helping. But I need all everything clear. Happy day!!!