Question and response
Question
dig spf.mx-rec.de. TXT
Answer
spf.mx-rec.de. 300 TXT "v=spf1 a:esa01.mx-rec.de a:esa02.mx-rec.de ip4:45.132.31.64 ip4:45.132.31.54 ip4:45.132.31.94 ~all"
Authority
mx-rec.de. 86400 NS helium.ns.hetzner.de.
mx-rec.de. 86400 NS hydrogen.ns.hetzner.com.
mx-rec.de. 86400 NS oxygen.ns.hetzner.com.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0