charite.de

Checked 21 October 2026, 22:06 UTC · via 8.8.8.8
!Passed with warnings
30 passed 4 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 mx include:spf.qb-feedback.com ip4:193.175.73.208 ip4:193.175.73.209 ip4:94.130.99.191 ip4:52.157.149.216 ip4:195.60.213.98 ip4:195.60.213.99 ip4:5.172.45.224/27 ip4:31.200.215.65/28 ip4:46.231.86.84/30 include:spf.sendinblue.com include:spf.emailsys.net include:amazonses.com include:spf.protection.outlook.com include:143687404.spf05.hubspotemail.net -all
DNS lookups
7 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 7 of 10 DNS lookups #2
    SPF record needs 7 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.charite.de)

Found

Record
v=DMARC1; p=quarantine; sp=quarantine; np=none; rua=mailto:dmarc@charite.de
Found at
_dmarc.charite.de
TagValueMeaning
vDMARC1Version
pquarantinePolicy
spquarantineSubdomain policy
ruamailto:dmarc@charite.deAggregate report addresses
npnone

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:dmarc@charite.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

warn

Selectors: mail

Found

Selectors
mail
_domainkey
NOERROR
SelectorKeyFlags
mailRSA 1024 bits

Checks

  • ✓ Keys found: mail #7
    DKIM keys found for this domain with selectors: mail
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: mail (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

pass

2 mail servers

Found

PriorityHostRecordsReverse DNS
10mail-ccm.charite.deA 193.175.73.208 AAAA 2001:638:815:1:fcf6:1dff:fe4d:7c85mail-ccm.charite.de ✓ mail-ccm.charite.de ✓
20mail-cvk-ext.charite.deA 193.175.73.209 AAAA 2001:638:815:1:342b:30ff:fe0e:2db8mail-cvk-ext.charite.de ✓ mail-cvk-ext.charite.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.
  • ✓ All hosts have IPv6 #11
    All MX records resolve to IPv6 addresses.
  • ✓ 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 4 MX addresss have a PTR record that resolves back to them.

TLS

info

MTA-STS enforce · TLS-RPT · DANE on 0 of 2 MX hosts

Found

MTA-STS record
v=STSv1; id=2026080601
Policy URL
https://mta-sts.charite.de/.well-known/mta-sts.txt
Mode
enforce
Allowed MX
mail-ccm.charite.de, mail-cvk-ext.charite.de
Max age
1209600 seconds
TLS-RPT record
v=TLSRPTv1; rua=mailto:dmarc@charite.de

DANE (TLSA records)

MX hostTLSADNSSEC
mail-ccm.charite.denone-
mail-cvk-ext.charite.denone-

Checks

  • ✓ Record published #32
    MTA-STS record found with id 2026080601.
  • ✓ Policy enforced #33
    The MTA-STS policy is enforced and cached for 336h0m0s.
  • ✓ All MX hosts covered #34
    Every MX host matches an mx: line of the MTA-STS policy.
  • ✓ Reports enabled #35
    TLS reports are sent to: mailto:dmarc@charite.de
  • 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://mta-sts.charite.de/Logo_Charite.svg

Found

Record
v=BIMI1;l=https://mta-sts.charite.de/Logo_Charite.svg
Found at
default._bimi.charite.de
Logo
https://mta-sts.charite.de/Logo_Charite.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.