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do.de

Checked 2026-10-21 22:14 UTC · first added 2026-10-21
!Passed with warnings Score 82 of 100

Domain & DNS

warn

28 passed 1 warn 0 failed

Areas

iRegistration iDelegation iNameservers !SOA ✓DNSSEC ✓Records

Problems

  • !
    Unusual SOA timers
    SOA · negative caching TTL (minimum) 2m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 4h, retry 1h, expire 7d, negative TTL 2m.
    #23

Recent checks

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Full report

Domain & DNS report for do.de ›

Mail

warn

31 passed 5 warn 0 failed

Areas

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

Problems

  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    No aggregate reports (rua)
    DMARC · DMARC record has no rua tag, so you receive no aggregate reports about who sends mail as your domain. Add rua=mailto:...
    #19
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: mail (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Not configured
    TLS · MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".
    #35
  • !
    No certificate (a=)
    BIMI · The logo is published without a Verified Mark Certificate. Gmail and Apple Mail only show BIMI logos with a VMC or CMC; Yahoo shows it without one.
    #38

Recent checks

!

Full report

Mail report for do.de ›