Sorry to hear about the problems with the emails. Since you've given us very little information on your website or any specific error messages or bounces, it would be very difficult for us to troubleshoot your problem. If you could provide at least account information (if you're hosted with us), and also the process in which you're seeing the problem occur. For example, you're saying that the problem occurs from a certain group of computers. Are sending emails to them? Or are you accessing a website with these computers and then trying to send an email through the website? What are the steps to duplicate the problem?
Please provide us the information and we would happy to look into the matter further.
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