It seems the MyDomain's DNS servers have been hacked and some rogue A and MX registers have been injected.<p>In my domain the rogue records are
egimenez.com. 1800 IN MX 0 m1.dnsix.com.
egimenez.com. 1800 IN A 69.25.27.173
egimenez.com. 1800 IN A 63.251.171.81
egimenez.com. 1800 IN A 66.150.161.140
egimenez.com. 1800 IN A 66.150.161.141
egimenez.com. 1800 IN A 72.32.231.8
egimenez.com. 1800 IN A 63.251.171.80
egimenez.com. 1800 IN A 69.25.27.170