sounds like they have done this before. untracable email.
accountant.com is a domain controlled by six nameservers. All of them are on different IP networks. Incoming mail for accountant.com is handled by two mailservers having a total of five IP numbers. There are five duplicate ipnumbers. Some of them are on the same IP network. accountant.com has one IP record. dr.com, 4u.net, who.net, soon.com, asia.com and at least 100 other hosts point to the same IP. finance-cars.com, expediagroup.com, greatusaflags.com, greatoutdoors.com, eastwestmatch.com and at least 100 other hosts share nameservers with this domain. 4u.net, fan.net, who.net, asia.com, chef.net and at least 100 other hosts share mailservers with this domain.