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synology.com

Checked 2026-10-22 10:53 UTC · first added 2026-10-21
!Passed with warnings Score 82 of 100

Domain & DNS

warn

30 passed 1 warn 0 failed

Areas

iRegistration iDelegation ✓Nameservers ✓SOA iDNSSEC !Records

Problems

  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change.
    #32

Recent checks

!

Full report

Domain & DNS report for synology.com ›

Mail

warn

23 passed 5 warn 0 failed

Areas

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

Problems

  • !
    Policy: quarantine
    DMARC · DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • !
    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: mail.synology.com, usmail.synology.com
    #11
  • !
    Signatures expire in 7h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-22T18:00:00Z (in 7h0m0s). Check that re-signing works.
    #21
  • !
    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 synology.com ›