Andy Durant wrote:
I thought about that but some of the customers in question are based in China and are on a shared server with thousands of non-related users.
Rather than whitelist by address (which as I said is easily forged), you should be setting up SMTP AUTH, so the users in China still use your server to send mail out. If you find that port 25 is blocked in China, you can use SMTP over SSL (port 465) or SMTP SUBMISSION (port 587).
John -- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5748
