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tele2.nl

Checked 2026-10-21 21:25 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

error

25 passed 2 warn 0 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration iDelegation ✓Nameservers ✓SOA !DNSSEC !Records

Problems

  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 5 iterations and a 8-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
  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: MX (30s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 10m; resolvers may use either.
    #32

Recent checks

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Mail

fail

19 passed 6 warn 1 failed

Areas

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

Problems

  • ✗
    Policy: none (monitoring only)
    DMARC · DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • !
    9 of 10 DNS lookups, with problems
    SPF · SPF record needs 9 DNS lookups (limit is 10). Problems found: include:spf1.tripolis.com does not exist or has no records; include:spf2.tripolis.com does not exist or has no records.
    #2
  • !
    No key under common selectors
    DKIM · The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.
    #7
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mx10.se.isp-net.nl, mx20.se.isp-net.nl
    #11
  • !
    2 void lookups
    SPF · 2 include/redirect targets does not exist or has no records (limit is 2). This usually is a stale include; remove it.
    #26
  • !
    Reverse DNS does not match
    MX · The PTR name of these addresses does not resolve back to the same address: 38.111.198.185 -> fe2-r2-in.la10.l.antispamcloud.com, 38.111.198.185 -> fe2-r2-in.la10.l.antispamcloud.com.
    #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

Recent checks

✗

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