united-domains.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
✗Problems found
24 passed 5 warnings 2 failed 2 info

SPF

fail

SPF record published

Found

Record
v=spf1 a:united-domains.managed-otrs.com ip4:82.135.96.208/28 ip4:80.152.226.24 ip4:89.31.137.0/24 ip4:213.183.18.0/28 ip4:213.183.18.32/27 ip4:213.131.239.224/28 ip4:213.203.225.128/27 ip4:89.31.143.228 ip4:3.121.141.11 ip4:94.186.159.215 include:26062152.spf07.hubspotemail.net include:spf.key-systems.net include:_spf.google.com include:spf.dixa.io include:_spf-corporate.ionos.com -all
DNS lookups
12 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✗
    12 DNS lookups, over the limit of 10
    SPF record needs 12 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.
    #2
  • ✓ 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

warn

p=reject (_dmarc.united-domains.de)

Found

Record
v=DMARC1; p=reject; rua=mailto:dmarc-reports@united-domains.de; rf=afrf; sp=none; fo=0; pct=100; ri=86400; adkim=s; aspf=r
Found at
_dmarc.united-domains.de
TagValueMeaning
vDMARC1Version
prejectPolicy
spnoneSubdomain policy
pct100Percentage of mail the policy applies to
ruamailto:dmarc-reports@united-domains.deAggregate report addresses
adkimsDKIM alignment (r = relaxed, s = strict)
aspfrSPF alignment (r = relaxed, s = strict)
fo0Failure reporting options
rfafrfFailure report format
ri86400Report interval (seconds)

Checks

  • ✓ Policy: reject #4
    DMARC policy is set to 'reject', which provides the strongest protection against email spoofing.
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • ✓ Applies to 100% of mail #18
    DMARC policy applies to all failing mail.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:dmarc-reports@united-domains.de
  • !
    Subdomains unprotected (sp=none)
    DMARC subdomain policy is sp=none, so spoofed mail from subdomains is not blocked. Consider sp=quarantine or sp=reject.
    #20
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

DKIM

warn

Selectors: google, s1, s2

Found

Selectors
google, s1, s2
_domainkey
NOERROR
SelectorKeyFlags
googleRSA 2048 bits
s1RSA 2048 bits
s2RSA 1024 bits

Checks

  • ✓ Keys found: google, s1, s2 #7
    DKIM keys found for this domain with selectors: google, s1, s2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: s2 (1024 bits). Rotate to a 2048-bit key.
    #23
  • ✓ No problematic flags #24
    No keys in test mode, revoked, or limited to SHA-1.

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
10smxint1.united-domains.deA 89.31.137.126smxint1.united-domains.de ✓
10smxint2.united-domains.deA 89.31.137.125intmail.udag.de ✓
100smxint3.united-domains.deA 89.31.137.125intmail.udag.de ✓

Checks

  • ✓ 3 MX records #9
    Found 3 MX records for this domain.
  • ✓ All hosts resolve #10
    All MX records resolve to valid IP addresses.
  • !
    Hosts without IPv6
    The following MX hosts could not be resolved to IPv6 addresses: smxint1.united-domains.de, smxint2.united-domains.de, smxint3.united-domains.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.
  • ✓ No CNAME targets #22
    No MX records point to a CNAME.
  • ✓ Reverse DNS confirmed #30
    All 3 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
smxint1.united-domains.denone-
smxint2.united-domains.denone-
smxint3.united-domains.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

fail

https://vmc.digicert.com/0b9f454d-ef4c-4169-a26f-cea56b1c3687.svg

Found

Record
v=BIMI1;l=https://vmc.digicert.com/0b9f454d-ef4c-4169-a26f-cea56b1c3687.svg; a=https://vmc.digicert.com/0b9f454d-ef4c-4169-a26f-cea56b1c3687.pem
Found at
default._bimi.united-domains.de
Logo
https://vmc.digicert.com/0b9f454d-ef4c-4169-a26f-cea56b1c3687.svg
Certificate
https://vmc.digicert.com/0b9f454d-ef4c-4169-a26f-cea56b1c3687.pem

Checks

  • ✓ Logo and certificate published #38
    BIMI logo: https://vmc.digicert.com/0b9f454d-ef4c-4169-a26f-cea56b1c3687.svg; certificate: https://vmc.digicert.com/0b9f454d-ef4c-4169-a26f-cea56b1c3687.pem
  • ✗
    DMARC not strict enough for BIMI
    Mail clients will not show the logo. BIMI requires a subdomain policy other than sp=none.
    #39