Email Authentication
kudyznudy.cz
SPF
passDeclares which servers may send mail for this domain.
v=spf1 mx a:cztrmKZN-app04.kudyznudy.cz ip4:85.207.0.157 include:sendgrid.net include:amazonses.com ~all
DKIM
noneCryptographic signature on outbound mail (selector: none).
No record published.
DMARC
warningTells receivers what to do with mail that fails SPF/DKIM. Policy: none.
v=DMARC1;p=none;pct=100;adkim=r;aspf=r