flaschenpost.de

Checked 21 October 2026, 22:30 UTC · via 8.8.8.8
!Passed with warnings
26 passed 5 warnings 0 failed 2 info

SPF

pass

SPF record published

Found

Record
v=spf1 mx a ip4:23.97.162.202 ip4:40.68.201.58 ip4:40.68.201.65 ip4:40.68.195.137 ip4:40.68.204.18 ip4:40.68.201.211 ip4:40.68.201.206 ip4:40.115.37.106 ip4:80.155.184.148/28 ip4:212.101.211.122 ip4:167.89.98.167 ip4:213.95.132.52 include:tenant.euvino.spf.martrexodns.com include:spf.mailjet.com include:_spf.salesforce.com include:mail.zendesk.com include:spf.protection.outlook.com include:_spf.psm.knowbe4.com include:spf.codepiraten.com -all
DNS lookups
10 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 10 of 10 DNS lookups #2
    SPF record needs 10 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=quarantine (_dmarc.flaschenpost.de)

Found

Record
v=DMARC1; p=quarantine; pct=100; rua=mailto:it@flaschenpost.de; ruf=mailto:it@flaschenpost.de
Found at
_dmarc.flaschenpost.de
TagValueMeaning
vDMARC1Version
pquarantinePolicy
pct100Percentage of mail the policy applies to
ruamailto:it@flaschenpost.deAggregate report addresses
rufmailto:it@flaschenpost.deFailure report addresses

Checks

  • !
    Policy: quarantine
    DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • ✓ 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:it@flaschenpost.de
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

DKIM

pass

Selectors: s1, s2

Found

Selectors
s1, s2
_domainkey
NOERROR
SelectorKeyFlags
s1RSA 2048 bits
s2RSA 2048 bits

Checks

  • ✓ Keys found: s1, s2 #7
    DKIM keys found for this domain with selectors: s1, s2
  • ✓ Strong keys #23
    DKIM keys are strong enough: s1: RSA 2048 bits; s2: 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

1 mail server

Found

PriorityHostRecordsReverse DNS
0flaschenpost-de.mail.protection.outlook.comA 52.101.209.153 A 52.101.68.10 A 52.101.68.8 A 52.101.209.28 AAAA 2a01:111:f403:ca04::b AAAA 2a01:111:f403:c967::a AAAA 2a01:111:f403:ca09::22 AAAA 2a01:111:f403:ca21::10mail-cpjpr04cu00101.inbound.protection.outlook.com ✓ mail-dbbpr03cu00102.inbound.protection.outlook.com ✓ mail-du0pr03cu00100.inbound.protection.outlook.com ✓ mail-cpjpr05cu00104.inbound.protection.outlook.com ✓ mail-dbbpr03cu00103.inbound.protection.outlook.com ✓ mail-cpjpr05cu00102.inbound.protection.outlook.com ✓ mail-am7pr02cu00302.inbound.protection.outlook.com ✓ mail-matpr05cu00100.inbound.protection.outlook.com ✓

Checks

  • ✓ 1 MX record #9
    Found 1 MX records for this domain.
  • ✓ All hosts resolve #10
    All MX records resolve to valid IP addresses.
  • ✓ All hosts have IPv6 #11
    All MX records resolve to IPv6 addresses.
  • !
    Single MX host, no backup
    Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • ✓ At most 5 MX records #13
    Found 1 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 8 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 1 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
flaschenpost-de.mail.protection.outlook.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

warn

https://image.flaschenpost.de/nl/design_ci/BM_160x160px.svg

Found

Record
v=BIMI1;l=https://image.flaschenpost.de/nl/design_ci/BM_160x160px.svg
Found at
default._bimi.flaschenpost.de
Logo
https://image.flaschenpost.de/nl/design_ci/BM_160x160px.svg

Checks

  • !
    No certificate (a=)
    The logo is published without a Verified Mark Certificate. Gmail and Apple Mail only show BIMI logos with a VMC or CMC; Yahoo shows it without one.
    #38
  • ✓ DMARC meets BIMI requirements #39
    DMARC is enforced on all mail, as BIMI requires.