Not solved yet. We have had problems with IP reputation and Miracare for nearly a year getting gradually more frequent but in last week it became 3 or 4 times per day. It has been a complete nightmare. Originally we would get a transmission msg:- Error 550- rejected due to bad IP reputation. At least we knew there was aproblem and could renew our IP address. As of last week the rejection msgs stopped. Then all Emails are accepted for transmission but binned by BT. You don't know it has happenned until your customers start complaining about not getting emails. This is having a serious impact on our ability to do business. BT Frontline support just tell you to check your network for malware and reboot your router. 'Something on your network must be spamming' and wash thier hands of the problem. Eventually got to 3rd line support and they were not much better. More knowledgeable but still pushing same unhelpful answers. I spent months looking into this without finding anything any evidence of a compromised PC on our network. 2 weeks ago I installed a packet sniffer to log and check all traffic going out through the router and have still found not 1 single spam email leaving our network. We have a low volume of email traffic (about 120 individual emails per day in total from 15 users) and do not send bulk emails, unsolicited emails or emails to large numbers of 'TO addresses'.
BT blame Miracare and say that they will not tell them why they blacklist addresses. As far as I am concerned BT are providing me with IP address and BT are blocking it. They have to take responsibilty for their service and not blame subcontractors.
Today I was told that as from tomorrow BT are "dropping the IP reputation hurdle; due to the large number of customers that are having problems". I await with interest to see if this fixes the problem.
