tha.de

Checked 22 October 2026, 00:40 UTC · via 8.8.8.8
!Passed with warnings
29 passed 3 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:141.82.11.25/24 ip4:141.82.217.130/24 ip6:2001:638:102:2::217:131/80 ip6:2001:638:102:201::11:25/80 include:_spf.rexx-suite.com a:bvbvxmail.bib-bvb.de include:spf.protection.outlook.com include:customer.securityeducation.com -all
DNS lookups
4 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 4 of 10 DNS lookups #2
    SPF record needs 4 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.tha.de)

Found

Record
v=DMARC1; p=reject; adkim=s; aspf=s; rua=mailto:dmarc.reports@hs-augsburg.de;ruf=mailto:dmarc.reports@hs-augsburg.de;
Found at
_dmarc.tha.de
External report address
mailto:dmarc.reports@hs-augsburg.de (not authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:dmarc.reports@hs-augsburg.deAggregate report addresses
rufmailto:dmarc.reports@hs-augsburg.deFailure report addresses
adkimsDKIM alignment (r = relaxed, s = strict)
aspfsSPF alignment (r = relaxed, s = strict)

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.reports@hs-augsburg.de
  • ✓ Subdomain policy: reject #20
    Subdomains are covered by policy 'reject'.
  • !
    Report address not authorized
    These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:dmarc.reports@hs-augsburg.de (needs tha.de._report._dmarc.hs-augsburg.de). Ask the report provider to publish the record, or check the address.
    #29

DKIM

pass

Selectors: dkim, selector1

Found

Selectors
dkim, selector1
_domainkey
NOERROR
SelectorKeyFlags
dkimRSA 2048 bits
selector1RSA 2048 bits

Checks

  • ✓ Keys found: dkim, selector1 #7
    DKIM keys found for this domain with selectors: dkim, selector1
  • ✓ Strong keys #23
    DKIM keys are strong enough: dkim: RSA 2048 bits; selector1: RSA 2048 bits.
  • ✓ No problematic flags #24
    No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

pass

Signed, DS published at parent

Found

DNSKEY records
Yes (2)
DS at parent
Yes
Algorithms
RSASHA256 (8)
Key tags
11941, 58234
Signatures valid until
1 November 2026, 02:11 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 2026-11-01 #21
    DNSKEY signatures are valid until 2026-11-01T02:11:14Z.

MX

pass

2 mail servers

Found

PriorityHostRecordsReverse DNS
30postfix1-out.RZ.HS-Augsburg.deA 141.82.217.130 AAAA 2001:638:102:2::217:130postfix1-out.RZ.HS-Augsburg.DE ✓ postfix1-out.RZ.HS-Augsburg.DE ✓
30postfix2-out.RZ.HS-Augsburg.deA 141.82.217.131 AAAA 2001:638:102:2::217:131postfix2-out.RZ.HS-Augsburg.DE ✓ postfix2-out.RZ.HS-Augsburg.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

warn

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

Found

DANE (TLSA records)

MX hostTLSADNSSEC
postfix1-out.RZ.HS-Augsburg.de3 0 1 c054c77ae97359f2…Yes
postfix2-out.RZ.HS-Augsburg.de3 0 1 c054c77ae97359f2…Yes

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
  • !
    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