Email security & deliverability · grade A
v=spf1 include:_spf1.mueller.de include:_spf2.mueller.de include:_spf3.mueller.de include:_spf4.mueller.de include:_spf5.mueller.de include:_spf6.mueller.de include:_spf7.mueller.de include:_spf8.mueller.de include:_spf9.mueller.de include:_spf.retarus.com -all