Exchange 2013 has a 1300-ish limit on the number of allowed IPs we can set in the list (the limit is on the corresponding AD attribute actually). Here are a few tips to workaround this limitation:

  • create another receive connector with remaining IP addresses with the same set of permissions.

You get another 1300 ~ IPs that can be added.

  • consider consolidating those IPs into supernet ranges. There are some good calculators you can use online that will do that for you.

For example instead of


=> One entry – 3 IPs

Thanks to Akshay Katti (PFE India) and Richard Timmering (PFE US) for these !