krug.org.pl

DNS records live

NS

• ns1.yum.pl
• ns3.yum.pl

MX

• 10 mx-r6bby.vipserv.org

Email authentication weak

SPF

v=spf1 include:s.yum.pl mx a -all

strict (-all)

DMARC

not published

DKIM

no key found at common selectors

Certificate (current)

Full certificate history on crt.sh ↗

Linked from (2)

• rubycommunityconference.com×1
• therubypassport.com×1