mail.iaio.ir has one IP number , which is the same as for iaio.ir, but no corresponding reverse pointer. aig.ir, asra.ir, iaio.ir, iaci.ir, iepg.ir and at least 71 other hosts point to the same IP. iaio.ir use this as a mailserver. iaio.ir is a domain controlled by two nameservers at isiran.com. They are on the same IP network. Incoming mail for iaio.ir is handled by one mailserver at iaio.ir themselves. mail.iaio.ir is hosted on a server in Iran.