djb.de

Checked 21 October 2026, 22:14 UTC · via 8.8.8.8
✗Problems found
17 passed 7 warnings 1 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 mx a include:ispgateway.de include:spfhard.crsend.com include:spf.protection.outlook.com -ip4:85.215.3.13 ~all
DNS lookups
5 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 5 of 10 DNS lookups #2
    SPF record needs 5 DNS lookups (limit is 10).
  • ✓ Ends with ~all #3
    SPF record properly uses ~all to restrict unauthorized senders.
  • ✓ Record published #6
    SPF record exists for this domain.
  • ✓ Single record #16
    Exactly one SPF record is published.
  • ✓ Valid syntax #25
    All SPF mechanisms and modifiers are valid.
  • ✓ No void lookups #26
    All include/redirect targets exist.
  • ✓ No overly broad IP ranges #27
    All ip4/ip6 ranges are narrow enough.

DMARC

fail

p=none (_dmarc.djb.de)

Found

Record
v=DMARC1;p=none;sp=none;pct=25;rua=mailto:geschaeftsstelle@djbev.onmicrosoft.com;aspf=s;adkim=r;
Found at
_dmarc.djb.de
External report address
mailto:geschaeftsstelle@djbev.onmicrosoft.com (not authorized)
TagValueMeaning
vDMARC1Version
pnonePolicy
spnoneSubdomain policy
pct25Percentage of mail the policy applies to
ruamailto:geschaeftsstelle@djbev.onmicrosoft.comAggregate report addresses
adkimrDKIM alignment (r = relaxed, s = strict)
aspfsSPF alignment (r = relaxed, s = strict)

Checks

  • ✗
    Policy: none (monitoring only)
    DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:geschaeftsstelle@djbev.onmicrosoft.com
  • !
    Report address not authorized
    These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:geschaeftsstelle@djbev.onmicrosoft.com (needs djb.de._report._dmarc.djbev.onmicrosoft.com). Ask the report provider to publish the record, or check the address.
    #29

DKIM

warn

No keys found under the checked selectors

Found

Selectors
None found
_domainkey
NOERROR

Checks

  • !
    No key under common selectors
    The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.
    #7

DNSSEC

warn

Not signed

Found

DNSKEY records
No (0)
DS at parent
No

Checks

  • !
    Not enabled
    DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8

MX

warn

3 mail servers

Found

PriorityHostRecordsReverse DNS
10djb-de.mail.protection.outlook.comA 52.101.170.2 A 52.101.170.0 A 52.101.170.1 A 52.101.168.0 AAAA 2a01:111:f403:ca2d:: AAAA 2a01:111:f403:ca2d::1 AAAA 2a01:111:f403:ca27:: AAAA 2a01:111:f403:ca2d::2mail-fr6p281cu00202.inbound.protection.outlook.com ✓ mail-fr5p281cu00500.inbound.protection.outlook.com ✓ mail-fr4p281cu03101.inbound.protection.outlook.com ✓ mail-beup281cu00100.inbound.protection.outlook.com ✓ mail-fr5p281cu00500.inbound.protection.outlook.com ✓ mail-fr4p281cu03101.inbound.protection.outlook.com ✓ mail-beup281cu00100.inbound.protection.outlook.com ✓ mail-fr6p281cu00202.inbound.protection.outlook.com ✓
20mxlb.ispgateway.deA 80.67.18.126mxlb.ispgateway.de ✓
30exchg.djb.deCNAME djbexchg.no-ip.org

Checks

  • ✓ 3 MX records #9
    Found 3 MX records for this domain.
  • !
    Hosts without IP addresses
    The following MX hosts could not be resolved to IP addresses: exchg.djb.de
    #10
  • !
    Hosts without IPv6
    The following MX hosts could not be resolved to IPv6 addresses: mxlb.ispgateway.de, exchg.djb.de
    #11
  • ✓ Redundant MX hosts #12
    Found 3 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 3 MX records, which is within the recommended range (1-5).
  • ✓ No localhost targets #14
    No MX records pointing to localhost found.
  • ✓ No private IP addresses #15
    No MX records resolving to private IP addresses found.
  • !
    Hosts are CNAMEs
    MX records must point to a host name with A/AAAA records, not to a CNAME: exchg.djb.de -> djbexchg.no-ip.org
    #22
  • ✓ Reverse DNS confirmed #30
    All 9 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 3 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
djb-de.mail.protection.outlook.comnone-
mxlb.ispgateway.denone-
exchg.djb.denone-

Checks

  • !
    Not configured
    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
  • i
    Not configured
    TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.
    #35
  • i
    Not used
    No MX host publishes TLSA records. DANE lets senders verify your mail server's certificate through DNSSEC; it requires DNSSEC on the MX host's zone.
    #36

BIMI

info

No BIMI record

Checks

  • i
    Not configured
    BIMI shows your logo next to your mail in supporting mail clients. It requires DMARC enforcement.
    #38