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vattenfall.com

Checked 2026-10-22 11:20 UTC · first added 2026-10-21
✗Problems found Score 69 of 100

Domain & DNS

warn

31 passed 2 warn 0 failed

Areas

iRegistration !Delegation ✓Nameservers ✓SOA !DNSSEC iRecords

Problems

  • !
    No IPv6
    Delegation · None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 10 iterations and a 10-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

!

Full report

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Mail

fail

26 passed 5 warn 1 failed

Areas

✓SPF ✓DMARC ✗DKIM !DNSSEC !MX !TLS ✓BIMI

Problems

  • ✗
    Weak DKIM key
    DKIM · RSA keys shorter than 1024 bits can be cracked and are ignored by receivers (RFC 8301): default (512 bits). Rotate to a 2048-bit key.
    #23
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mx.vattenfall.com
    #11
  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    Signatures expire in 78h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-25T16:59:51Z (in 78h0m0s). Check that re-signing works.
    #21
  • !
    Key in test mode
    DKIM · These keys have t=y, so receivers treat DKIM failures as a test: default, dkim. Remove t=y once DKIM works.
    #24
  • !
    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

Recent checks

✗

Full report

Mail report for vattenfall.com ›