incoming emails dont work in my magento marketplace website

incoming emails dont work in my magento marketplace website

hi, i am new to zoho mail, i have a magento marketplace website and want to use zoho,i can send and recieve emails without a problem,but when i add my email address to my website,only some emails work,when somebody adds a product i should recieve an email,which does not happen,yet the person adding the product recieves an email,my main contact form does not work,it seems all emails coming in are not recieved,yet all automated outgoing emails work,if somebody could help that would be great thanks michael