x3e37b646.static.telefonica.de has no MX records.
Question and response
Question
dig x3e37b646.static.telefonica.de. MX
Answer
The response has no answer records.
Authority
static.telefonica.de. 600 SOA ns1.telefonica.de. hostmaster.telefonica.de. 186 28800 7200 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0