I have also just noticed that mx1.tnz.mail.yahoo.com and mx2.tnz.mail.yahoo.com have the same ip address (currently anyway). Any sane reason why you'd want to do that? dig xtra.co.nz mx ; <<>> DiG 9.2.5 <<>> xtra.co.nz mx ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28918 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2 ;; QUESTION SECTION: ;xtra.co.nz. IN MX ;; ANSWER SECTION: xtra.co.nz. 157 IN MX 10 mx1.tnz.mail.yahoo.com. xtra.co.nz. 157 IN MX 20 mx2.tnz.mail.yahoo.com. ;; AUTHORITY SECTION: xtra.co.nz. 12331 IN NS alien.xtra.co.nz. xtra.co.nz. 12331 IN NS terminator.xtra.co.nz. ;; ADDITIONAL SECTION: mx1.tnz.mail.yahoo.com. 157 IN A 124.108.96.67 mx2.tnz.mail.yahoo.com. 1309 IN A 124.108.96.67 -- ------------------------------------------------------------------------ Jean-Francois Pirus <jfp(a)clearfield.com> Senior Software Engineer Phone (+64-9) 358 2081 Clearfield Software Ltd Fax (+64-9) 358 2083 4th Floor 8-10 Whitaker Place Mob (+64-21) 640 779 P O Box 3901 Auckland, New Zealand ------------------------------------------------------------------------