Domains with DNS TXT v=spf1 a mx include:spf1.c-trace.de include:spf.protection.outlook.com include:spf.crsend.com include:spf.burg-spf.de -all
There is 1 domain that have DNS TXT set to v=spf1 a mx include:spf1.c-trace.de include:spf.protection.outlook.com include:spf.crsend.com include:spf.burg-spf.de -all.