mail.trithanhag.com has one IP number , which is the same as for trithanhag.com, but no corresponding reverse pointer. hssv.vn, itus.vn, apcs.vn, vgac.net, 19st.net and at least 88 other hosts point to the same IP. trithanhag.com use this as a mailserver. trithanhag.com is delegated to two nameservers, however two extra nameservers are listed in the zone. There are two duplicated IP numbers. Some of them are on the same IP network. Incoming mail for trithanhag.com is handled by two mailservers on different IP networks. mail.trithanhag.com is hosted on a server in Vietnam.