Name Servers
smtp.cz. 1200 IN NS alfa.ns.active24.cz. smtp.cz. 1200 IN NS beta.ns.active24.cz. smtp.cz. 1200 IN NS gama.ns.active24.sk.
Mail Servers
smtp.cz. 1200 IN MX 10 mx1.active24.com. smtp.cz. 1200 IN MX 20 mx2.active24.com.
SOA Details
smtp.cz. 1200 IN SOA ns.dns4.cz. hostmaster.active24.cz. 2026022301 10800 1800 1209600 3600
Certificate Authority Authorization
No CAA records were returned at this registrable domain name. With no CAA policy, any public certificate authority (CA) may issue TLS certificates for names under this zone unless a parent publishes CAA; add issue / issuewild / iodef records to restrict issuance.
DMARC
No DMARC TXT record was returned (expected at `_dmarc.<domain>` with `v=DMARC1`). Without DMARC you cannot publish receiver policy or standard aggregate failure reports (RUA).
DKIM
No DKIM TXT with `v=DKIM1` was returned for the selector names we probe automatically.
SPF (Sender Policy Framework)
No SPF TXT record was returned (`v=spf1` / `spf2.0/`). SPF tells receivers which hosts may send mail for this domain; without it, aligned DMARC and spoofing defenses are weaker.
MTA-STS
This hostname does not publish an MTA-STS policy (no v=STSv1 TXT at _mta-sts.<name> and/or no policy at https://mta-sts.<name>/.well-known/mta-sts.txt).
DNSSEC Public Keys
smtp.cz. 1200 IN DNSKEY 257 3 13 0EK9ChwJW+CVCvP7mizQwEnR2OJpHgbLmilGV5OyqncZoOufo9fIbVrvxT6qid/T9sAWH7KOfzItPxkVOIbRjg== smtp.cz. 1200 IN DNSKEY 256 3 13 /nQy2zr3e4XOvfJLSZG3heo563nNkPruFFR3vfE1O7VWQafpjOJS+SHSBNOT8ewTOexdxeEUnwoEVvHVle5TaA==
Delegation Signer
smtp.cz. 1200 IN DS 22941 13 2 A914A44AE47BB3C3B6F3AE386E73F50171D574CEBEAFA21D27B05E3047C79354
DNSSEC Signatures
smtp.cz. 1200 IN RRSIG A 13 2 3600 1788942003 1786350003 33072 smtp.cz uPbw+0KX+amPy4nuMxI34Upmaw6DwrVd0xuyTFzXFu/7PBwpCzbir3XoLFyU4AH9NZvygvRF15SfrFn2YncPNw==