Mail domain report: uni-augsburg.de

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:137.250.2.0/24 ip4:54.229.2.165 ip4:52.30.130.201 ip4:52.17.45.98 ip4:52.16.190.81 ip4:193.174.97.18/32 ip6:2001:4ca0:10b:6::c1ae:6112 ip4:195.200.70.64/26 ip4:193.34.207.156/31 ip4:193.34.207.154/31 ip4:46.29.101.1/32 ip4:46.29.101.2/32 ip4:217.150.155.10/32 ip4:217.150.155.12/32 ip4:77.237.55.128/27 ip4:91.114.45.124/32 ip4:37.228.153.6/32 ip4:194.95.233.14/32 ip6:2001:638:d:c301:acdc:1979:2:c6/128 ip4:194.95.235.14/32 ip6:2001:638:d:c302:acdc:1979:2:c6/128 ip4:194.95.239.14/32 ip6:2001:638:d:c303:acdc:1979:2:c6/128 ip4:194.95.233.24/32 ip6:2001:638:d:c301:acdc:1979:2:d0/128 ip4:194.95.235.24/32 ip6:2001:638:d:c302:acdc:1979:2:d0/128 ip4:194.95.239.24/32 ip6:2001:638:d:c303:acdc:1979:2:d0/128 ip4:46.253.251.142/32 ip4:116.203.110.13/32 ip4:159.69.3.23/32 ~all
DNS lookups: 0 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✓ 0 of 10 DNS lookups #2

SPF record needs 0 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.uni-augsburg.de)

Found

Record: v=DMARC1; p=none; rua=mailto:mail-server@rz.uni-augsburg.de
Found at: _dmarc.uni-augsburg.de

Tag	Value	Meaning
v	DMARC1	Version
p	none	Policy
rua	mailto:mail-server@rz.uni-augsburg.de	Aggregate report addresses

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:mail-server@rz.uni-augsburg.de
✓ Report addresses in own domain #29

All report addresses are in your own organizational domain.

DKIM

warn

Selectors: s1

Found

Selectors: s1
_domainkey: NOERROR

Selector	Key	Flags
s1	RSA 1024 bits

Checks

✓ Keys found: s1 #7

DKIM keys found for this domain with selectors: s1
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: s1 (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

pass

Signed, DS published at parent

Found

DNSKEY records: Yes (3)
DS at parent: Yes
Algorithms: RSASHA256 (8)
Key tags: 34201, 36037, 27589
Signatures valid until: 8 November 2026, 22:11 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 2026-11-08 #21

DNSKEY signatures are valid until 2026-11-08T22:11:35Z.

MX

warn

3 mail servers

Found

Priority	Host	Records	Reverse DNS
10	a2541.mx.srv.dfn.de	A 194.95.233.14	a2541.mx.srv.dfn.de ✓
10	b2541.mx.srv.dfn.de	A 194.95.235.14	b2541.mx.srv.dfn.de ✓
10	c2541.mx.srv.dfn.de	A 194.95.239.14	c2541.mx.srv.dfn.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: a2541.mx.srv.dfn.de, b2541.mx.srv.dfn.de, c2541.mx.srv.dfn.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 3 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 3 of 3 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
a2541.mx.srv.dfn.de	3 0 1 9bec67f55f2afdb7…	Yes
b2541.mx.srv.dfn.de	3 0 1 9bec67f55f2afdb7…	Yes
c2541.mx.srv.dfn.de	3 0 1 9bec67f55f2afdb7…	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 3 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