otto-schmidt.de

Checked 21 October 2026, 23:42 UTC · via 8.8.8.8
✗Problems found
23 passed 3 warnings 1 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:spf.protection.outlook.com include:_spf.sendnode.com include:_spf.xqueue.com ip4:194.8.213.197 ip4:194.8.213.198 ip4:62.214.13.178 ip4:194.8.194.96 ip4:62.113.229.37 ip4:212.34.64.185 ip4:185.88.212.47 ip4:109.234.127.0/24 ip4:80.82.206.0/26 ip4:185.98.184.0/24 ip4:88.79.187.100 ip4:145.253.113.50 ip6:2a00:f48:1008::212:47:10 ~all
DNS lookups
3 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 3 of 10 DNS lookups #2
    SPF record needs 3 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.otto-schmidt.de)

Found

Record
v=DMARC1;p=none;rua=mailto:529e2d735c@rua.easydmarc.us;ruf=mailto:529e2d735c@ruf.easydmarc.us;fo=1
Found at
_dmarc.otto-schmidt.de
External report address
mailto:529e2d735c@rua.easydmarc.us (authorized)
External report address
mailto:529e2d735c@ruf.easydmarc.us (authorized)
TagValueMeaning
vDMARC1Version
pnonePolicy
ruamailto:529e2d735c@rua.easydmarc.usAggregate report addresses
rufmailto:529e2d735c@ruf.easydmarc.usFailure report addresses
fo1Failure reporting options

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:529e2d735c@rua.easydmarc.us
  • ✓ External report addresses authorized #29
    Report addresses in other domains have published their authorization.

DKIM

pass

Selectors: s1

Found

Selectors
s1
_domainkey
NOERROR
SelectorKeyFlags
s1RSA 2048 bits

Checks

  • ✓ Keys found: s1 #7
    DKIM keys found for this domain with selectors: s1
  • ✓ Strong keys #23
    DKIM keys are strong enough: s1: 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

3 mail servers

Found

PriorityHostRecordsReverse DNS
10mailrelay.netcologne.deA 194.8.194.96mailrelay.netcologne.de ✓
20asg.otto-schmidt.deA 194.8.213.197 A 62.214.13.178asg.otto-schmidt.de ✓ asg.otto-schmidt.de ✓
50asg2.otto-schmidt.deA 62.214.13.178asg.otto-schmidt.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: mailrelay.netcologne.de, asg.otto-schmidt.de, asg2.otto-schmidt.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 4 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
mailrelay.netcologne.denone-
asg.otto-schmidt.denone-
asg2.otto-schmidt.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