Emails to optimum.net ISP customers may result in a hold and/or delay. Currently, Optimum has an identified an IP address within the same range as one of our own addresses (but outside of our system) and is holding mail for addresses within that range. Again, the originating issue is outside of our network. We are working with both our spam filtering service and optimum.net towards an immediate correction and permanent resolution to prevent this from happening moving forward.