ZhangHuangbin wrote:
Because spammers like dynamic DNS services, they can simply re-dial to get a new IP address, then flooding again. Many ISPs use third-party RBL service to block spam, includes servers which has dynamic IP addresses. That's why you'd better use a static IP address for mail server.
well that maybe, but a large percentage of our customers seem to be using there cell phones to send and recieve emails, and we look bad if we are constantly blocking there emails. I only hope that whitelisting will over ride this is I enter there entire email domain as " @domain.com"