Mail domain report: rub.de

SPF

pass

SPF record published

Found

Record: v=spf1 exists:%{ir}.%{v}._spfx.mail.ruhr-uni-bochum.de exists:%{ir}._ip.%{l1r+}._spfx.mail.ruhr-uni-bochum.de ~all
DNS lookups: 2 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

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

SPF record needs 2 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.rub.de)

Found

Record: v=DMARC1; p=quarantine; sp=none; rua=mailto:Postmaster-rua@ruhr-uni-bochum.de
Found at: _dmarc.rub.de

Tag	Value	Meaning
v	DMARC1	Version
p	quarantine	Policy
sp	none	Subdomain policy
rua	mailto:Postmaster-rua@ruhr-uni-bochum.de	Aggregate 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:Postmaster-rua@ruhr-uni-bochum.de
!

Subdomains unprotected (sp=none)

DMARC subdomain policy is sp=none, so spoofed mail from subdomains is not blocked. Consider sp=quarantine or sp=reject.

#20
✓ Report addresses in own domain #29

All report addresses are in your own organizational domain.

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 (3)
DS at parent: Yes
Algorithms: ECDSAP256SHA256 (13)
Key tags: 20527, 32574, 13152
Signatures valid until: 4 November 2026, 21:55 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 2026-11-04 #21

DNSKEY signatures are valid until 2026-11-04T21:55:00Z.

MX

warn

1 mail server

Found

Priority	Host	Records	Reverse DNS
10	mi.ruhr-uni-bochum.de	A 134.147.42.228 A 134.147.53.154 A 134.147.53.148 AAAA 2a05:3e00:8:1001::8693:359a AAAA 2a05:3e00:c:1001::8693:2ae4 AAAA 2a05:3e00:8:1001::8693:3594	mx2.mail.ruhr-uni-bochum.de ✓ mx3.mail.ruhr-uni-bochum.de ✓ mx1.mail.ruhr-uni-bochum.de ✓ mx3.mail.ruhr-uni-bochum.de ✓ mx2.mail.ruhr-uni-bochum.de ✓ mx1.mail.ruhr-uni-bochum.de ✓

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 6 MX addresss have a PTR record that resolves back to them.

TLS

warn

MTA-STS testing · TLS-RPT · DANE on 1 of 1 MX hosts

Found

MTA-STS record: v=STSv1; id=20230707115700Z
Policy URL: https://mta-sts.rub.de/.well-known/mta-sts.txt
Mode: testing
Allowed MX: mi.ruhr-uni-bochum.de, mx1.mail.ruhr-uni-bochum.de, mx2.mail.ruhr-uni-bochum.de, mx3.mail.ruhr-uni-bochum.de
Max age: 86400 seconds
TLS-RPT record: v=TLSRPTv1;rua=mailto:tls-reports-a@ruhr-uni-bochum.de

DANE (TLSA records)

MX host	TLSA	DNSSEC
mi.ruhr-uni-bochum.de	2 1 1 7a314a072773d796…	Yes

Checks

✓ Record published #32

MTA-STS record found with id 20230707115700Z.
!

Policy in testing mode

With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.

#33
✓ 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:tls-reports-a@ruhr-uni-bochum.de
✓ DANE on all MX hosts #36

All 1 MX host 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