Mail domain report: studierendenwerk-muenchen-oberbayern.de

SPF

info

SPF record published

Found

Record: v=spf1 redirect=_spf.stwm.de
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).
i

Delegated via redirect

SPF record has no 'all' mechanism but redirects to _spf.stwm.de, whose policy applies.

#3
✓ 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.studierendenwerk-muenchen-oberbayern.de)

Found

Record: v=DMARC1; p=quarantine; rua=mailto:dmarc@stwm.de; ri=3600; fo=d; ruf=mailto:dmarc-ruf@stwm.de
Found at: _dmarc.studierendenwerk-muenchen-oberbayern.de
External report address: mailto:dmarc@stwm.de (authorized)
External report address: mailto:dmarc-ruf@stwm.de (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
rua	mailto:dmarc@stwm.de	Aggregate report addresses
ruf	mailto:dmarc-ruf@stwm.de	Failure report addresses
fo	d	Failure reporting options
ri	3600	Report interval (seconds)

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@stwm.de
✓ Subdomain policy: quarantine #20

Subdomains are covered by policy 'quarantine'.
✓ 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: RSASHA256 (8)
Key tags: 29467, 10369
Signatures valid until: 31 October 2026, 06:27 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 2026-10-31 #21

DNSKEY signatures are valid until 2026-10-31T06:27:04Z.

MX

pass

2 mail servers

Found

Priority	Host	Records	Reverse DNS
50	mailrelay1.lrz.de	A 129.187.255.133 AAAA 2001:4ca0:0:103::81bb:ff85	mailrelay1.lrz.de ✓ mailrelay1.lrz.de ✓
50	mailrelay2.lrz.de	A 129.187.255.134 AAAA 2001:4ca0:0:103::81bb:ff86	mailrelay2.lrz.de ✓ mailrelay2.lrz.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 host	TLSA	DNSSEC
mailrelay1.lrz.de	3 1 1 7579e53a665be8c1…	Yes
mailrelay2.lrz.de	3 1 1 8de81c8f4a56e829…	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

warn

https://www.studierendenwerk-muenchen-oberbayern.de/stwm_logo_12_dunkelblau_tiny_ps.svg

Found

Record: v=BIMI1; l=https://www.studierendenwerk-muenchen-oberbayern.de/stwm_logo_12_dunkelblau_tiny_ps.svg
Found at: default._bimi.studierendenwerk-muenchen-oberbayern.de
Logo: https://www.studierendenwerk-muenchen-oberbayern.de/stwm_logo_12_dunkelblau_tiny_ps.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.