plan.de

Checked 21 October 2026, 23:50 UTC · via 8.8.8.8
✗Problems found
25 passed 3 warnings 1 failed 3 info

SPF

fail

SPF record published

Found

Record
v=spf1 a ip4:212.72.168.150 ip4:217.110.152.174 ip4:83.135.49.130 include:_netblocks.mimecast.com a:mx1.mail-plan.info include:spf.protection.outlook.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

pass

p=reject (_dmarc.plan.de)

Found

Record
v=DMARC1; p=reject; sp=reject; rua=mailto:dmarc-feedback@plan.de; ruf=mailto:dmarc-reports@plan.de; aspf=r; adkim=r; ri=86400; pct=100
Found at
_dmarc.plan.de
TagValueMeaning
vDMARC1Version
prejectPolicy
sprejectSubdomain policy
pct100Percentage of mail the policy applies to
ruamailto:dmarc-feedback@plan.deAggregate report addresses
rufmailto:dmarc-reports@plan.deFailure report addresses
adkimrDKIM alignment (r = relaxed, s = strict)
aspfrSPF alignment (r = relaxed, s = strict)
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-feedback@plan.de
  • ✓ Subdomain policy: reject #20
    Subdomains are covered by policy 'reject'.
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

DKIM

pass

Selectors: selector1, selector2, google

Found

Selectors
selector1, selector2, google
_domainkey
NOERROR
SelectorKeyFlags
selector1RSA 2048 bits
selector2RSA 2048 bits
googleRSA 2048 bits

Checks

  • ✓ Keys found: selector1, selector2, google #7
    DKIM keys found for this domain with selectors: selector1, selector2, google
  • ✓ Strong keys #23
    DKIM keys are strong enough: selector1: RSA 2048 bits; selector2: RSA 2048 bits; google: RSA 2048 bits.
  • ✓ 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

2 mail servers

Found

PriorityHostRecordsReverse DNS
10eu-smtp-inbound-1.mimecast.comA 195.130.217.201 A 91.220.42.211 A 91.220.42.201 A 195.130.217.211 A 195.130.217.241 A 91.220.42.241eu-smtp-inbound-2.mimecast.com ✓ eu-smtp-inbound-2.mimecast.com ✓ eu-smtp-inbound-2.mimecast.com ✓ eu-smtp-inbound-2.mimecast.com ✓ eu-smtp-inbound-1.mimecast.com ✓ eu-smtp-inbound-1.mimecast.com ✓
10eu-smtp-inbound-2.mimecast.comA 195.130.217.241 A 91.220.42.201 A 91.220.42.211 A 195.130.217.201 A 195.130.217.211 A 91.220.42.241eu-smtp-inbound-1.mimecast.com ✓ eu-smtp-inbound-2.mimecast.com ✓ eu-smtp-inbound-2.mimecast.com ✓ eu-smtp-inbound-1.mimecast.com ✓ eu-smtp-inbound-2.mimecast.com ✓ eu-smtp-inbound-1.mimecast.com ✓

Checks

  • ✓ 2 MX records #9
    Found 2 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: eu-smtp-inbound-1.mimecast.com, eu-smtp-inbound-2.mimecast.com
    #11
  • ✓ Redundant MX hosts #12
    Found 2 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 2 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 12 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 2 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
eu-smtp-inbound-1.mimecast.comnone-
eu-smtp-inbound-2.mimecast.comnone-

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