arcor.de

Checked 21 October 2026, 21:30 UTC · via 8.8.8.8
!Passed with warnings
27 passed 5 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:vodafonemail.de ~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

warn

p=reject (_dmarc.arcor.de)

Found

Record
v=DMARC1; p=reject; rua=mailto:adeeb5c538f9684@rep.dmarcanalyzer.com,mailto:sysadmin@mediabeam.com; sp=none; fo=1
Found at
_dmarc.arcor.de
External report address
mailto:adeeb5c538f9684@rep.dmarcanalyzer.com (authorized)
External report address
mailto:sysadmin@mediabeam.com (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
spnoneSubdomain policy
ruamailto:adeeb5c538f9684@rep.dmarcanalyzer.com,mailto:sysadmin@mediabeam.comAggregate report addresses
fo1Failure reporting options

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:adeeb5c538f9684@rep.dmarcanalyzer.com, mailto:sysadmin@mediabeam.com
  • !
    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
  • ✓ External report addresses authorized #29
    Report addresses in other domains have published their authorization.

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

pass

Signed, DS published at parent

Found

DNSKEY records
Yes (2)
DS at parent
Yes
Algorithms
ECDSAP256SHA256 (13)
Key tags
35483, 51267
Signatures valid until
13 November 2026, 00:12 UTC

Checks

  • ✓ Signed, DS published at parent #8
    DNSSEC is enabled for this domain (DNSKEY and DS present), providing additional security for DNS lookups.
  • ✓ Signatures valid until 2026-11-13 #21
    DNSKEY signatures are valid until 2026-11-13T00:12:35Z.

MX

warn

2 mail servers

Found

PriorityHostRecordsReverse DNS
10mx3.vodafonemail.deA 2.207.151.53mx3.vodafonemail.de ✓
10mx5.vodafonemail.deA 2.207.217.30mx5.vodafonemail.de ✓

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: mx3.vodafonemail.de, mx5.vodafonemail.de
    #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 2 MX addresss have a PTR record that resolves back to them.

TLS

warn

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

Found

MTA-STS record
v=STSv1;id=20251103T120000Z
Policy URL
https://mta-sts.arcor.de/.well-known/mta-sts.txt
Mode
enforce
Allowed MX
mx5.vodafonemail.de, mx3.vodafonemail.de, mx.vodafonemail.de, mxd.gigamail.de
Max age
3600 seconds

DANE (TLSA records)

MX hostTLSADNSSEC
mx3.vodafonemail.de3 0 1 2d4799c928d03900… 3 0 1 6a2d3cc15d83270d… 3 0 1 aef0583067a8e041… 3 0 1 25ab7981675e215c… 3 0 1 2cf6681ce5499de2… 3 0 1 b436bc3af07c1e0f… 3 0 1 8c7cdffc4dd251af…Yes
mx5.vodafonemail.de3 0 1 8c7cdffc4dd251af… 3 0 1 25ab7981675e215c… 3 0 1 2cf6681ce5499de2… 3 0 1 2d4799c928d03900… 3 0 1 aef0583067a8e041… 3 0 1 6a2d3cc15d83270d… 3 0 1 b436bc3af07c1e0f…Yes

Checks

  • ✓ Record published #32
    MTA-STS record found with id 20251103T120000Z.
  • !
    Policy cached too briefly
    The MTA-STS policy is enforced, but max_age is only 3600 seconds; use at least a week (604800) so the policy stays cached.
    #33
  • ✓ All MX hosts covered #34
    Every MX host matches an mx: line of the MTA-STS policy.
  • !
    Not configured
    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
  • ✓ DANE on all MX hosts #36
    All 2 MX hosts publish DNSSEC-validated TLSA records.

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