"v=spf1 ip6:2xxx1:7e11::fxxx:9rrr:fe26:bxxx/64 -all"
OR v=spf1 a mx ip4:xxx.xxx.xxx.xxx -all
authorized to send email on your behalf. Make sure you replace the xxx with your IP4 and IP6 address. So is a spammer sending email using fake reply to address , its your will be stopped.v=DMARC1; p=none; adkim=s; aspf=s; pct=100; rua=mailto:dmarc@domain.com
v=
DMARC1 is mandatory