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vzinfo.nl

Checked 2026-10-21 21:26 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

error

25 passed 1 warn 0 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration iDelegation iNameservers iSOA !DNSSEC iRecords

Problems

  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 10 iterations and a 2-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Recent checks

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Full report

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Mail

warn

26 passed 5 warn 0 failed

Areas

✓SPF ✓DMARC !DKIM ✓DNSSEC !MX !TLS iBIMI

Problems

  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: externemail.rivm.nl
    #11
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: default (1024 bits), selector1 (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Addresses without reverse DNS
    MX · These MX addresses have no PTR record, which many receivers treat as a spam signal: 2001:610:430:ffff::17:16 (externemail-mx2.rivm.nl). Ask your hosting provider to set one.
    #30
  • !
    Not configured
    TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.
    #32
  • !
    Not all MX hosts use DANE
    TLS · These MX hosts publish no TLSA records, so mail to them is not protected by DANE: externemail-mx2.rivm.nl.
    #36

Recent checks

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