dmarc poc

  18:56:50 | records: 36644 | dups: 0 | errors: 1 | sources: cache:36644 messages:0  | imap status: idle | last imap fetch: 18:56:48

records

parse errors

unique source IPs

report date range

2026-05-27 — 2026-09-01 02:00:00

Top 10 source IPs

network	count
STRATO-RZG-KA-SWH	8

Top 10 header-from domains

domain	count
newt.example.com	3
xerus.example.com	2
iguana.example.com	1
weasel.example.com	1
zebu.example.com	1

Phase 1 — Discovery: who is sending mail from your domains? ⓘYou have published p=none and are collecting data. Nobody is being blocked yet.

Focus on message volume, not IP count — a source sending 50 000 messages is urgent; one sending 3 is noise.

Both-fail sources (DKIM fail AND SPF fail) are either spoofing attempts or services that were set up without telling you. Surface these first.

Expand a domain, then open "By source IP" to see the quadrant breakdown per prefix group.

Sender landscape

both pass SPF fail DKIM fail both fail

newt.example.com 3

100%

UNKNOWN total 3

IP	PTR	Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	3

google.com total 3

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	newt.example.com	1	none	pass	fail	2026-06-22 02:00
85.215.255.3	newt.example.com	1	none	pass	fail	2026-06-30 02:00
85.215.255.3	newt.example.com	1	none	pass	fail	2026-05-27 02:00

xerus.example.com 2

100%

UNKNOWN total 2

IP	PTR	Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	2

Enterprise Outlook total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	xerus.example.com	1	none	pass	fail	2026-09-01 02:00

Outlook.com total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	xerus.example.com	1	none	pass	fail	2026-08-20 02:00

iguana.example.com 1

100%

UNKNOWN total 1

IP	PTR	Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	1

google.com total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	iguana.example.com	1	none	pass	fail	2026-07-31 02:00

weasel.example.com 1

100%

UNKNOWN total 1

IP	PTR	Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	1

Enterprise Outlook total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	weasel.example.com	1	none	pass	fail	2026-08-03 02:00

zebu.example.com 1

100%

UNKNOWN total 1

IP	PTR	Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	1

Yahoo total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	zebu.example.com	1	none	pass	fail	2026-08-28 02:00

Phase 2 — Hardening: what would break if you tightened the policy? ⓘYou understand your sender landscape and want to move from p=none toward p=quarantine or p=reject. The risk is collateral damage to legitimate mail.

Policy readiness % = share of messages that would survive a reject policy today.

SPF-only sources need DKIM signing added in their sending platform.

DKIM-only sources need their SPF record aligned with your From: domain.

No DMARC alignment sources send all mail failing — configure or block.

Inconsistent sources have mixed results — investigate per-IP.

DMARC readiness

both pass SPF fail DKIM fail both fail

newt.example.com 3 / 3

100%

UNKNOWN 3 / 3

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	3 / 3

DKIM-only — SPF not aligned

google.com total 3

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	newt.example.com	1	none	pass	fail	2026-06-22 02:00
85.215.255.3	newt.example.com	1	none	pass	fail	2026-06-30 02:00
85.215.255.3	newt.example.com	1	none	pass	fail	2026-05-27 02:00

xerus.example.com 2 / 2

100%

UNKNOWN 2 / 2

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	2 / 2

DKIM-only — SPF not aligned

Enterprise Outlook total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	xerus.example.com	1	none	pass	fail	2026-09-01 02:00

Outlook.com total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	xerus.example.com	1	none	pass	fail	2026-08-20 02:00

iguana.example.com 1 / 1

100%

UNKNOWN 1 / 1

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	1 / 1

DKIM-only — SPF not aligned

google.com total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	iguana.example.com	1	none	pass	fail	2026-07-31 02:00

weasel.example.com 1 / 1

100%

UNKNOWN 1 / 1

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	1 / 1

DKIM-only — SPF not aligned

Enterprise Outlook total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	weasel.example.com	1	none	pass	fail	2026-08-03 02:00

zebu.example.com 1 / 1

100%

UNKNOWN 1 / 1

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	1 / 1

DKIM-only — SPF not aligned

Yahoo total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	zebu.example.com	1	none	pass	fail	2026-08-28 02:00

Phase 3 — Steady state: did something break? Is anyone spoofing you? ⓘYou have a tight policy in place (p=quarantine or p=reject). Watch for anomalies.

New sources — an IP appearing for the first time in the last 30 days that was not seen before. Could be a new legitimate sender nobody configured, or the start of a spoofing campaign.

Active failures — sources still failing DMARC under a strict policy in the last 30 days. Persistent failures with high volume are either spoofing or a misconfigured legitimate service that needs fixing.

If a major reporter (Google, Microsoft) stops appearing, your rua= address may be bouncing.

Alignment health — last 30 days

both pass SPF fail DKIM fail both fail

05-27

06-22

06-30

07-31

08-03

08-20

08-28

09-01

newt.example.com 3 / 3

100%

05-27

06-22

06-30

07-31

08-03

08-20

08-28

09-01

UNKNOWN new 3 / 3

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	0 / 3

google.com total 3

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	newt.example.com	1	none	pass	fail	2026-06-22 02:00
85.215.255.3	newt.example.com	1	none	pass	fail	2026-06-30 02:00
85.215.255.3	newt.example.com	1	none	pass	fail	2026-05-27 02:00

xerus.example.com 2 / 2

100%

05-27

06-22

06-30

07-31

08-03

08-20

08-28

09-01

UNKNOWN new 2 / 2

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	0 / 2

Enterprise Outlook total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	xerus.example.com	1	none	pass	fail	2026-09-01 02:00

Outlook.com total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	xerus.example.com	1	none	pass	fail	2026-08-20 02:00

iguana.example.com 1 / 1

100%

05-27

06-22

06-30

07-31

08-03

08-20

08-28

09-01

UNKNOWN new 1 / 1

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	0 / 1

google.com total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	iguana.example.com	1	none	pass	fail	2026-07-31 02:00

weasel.example.com 1 / 1

100%

05-27

06-22

06-30

07-31

08-03

08-20

08-28

09-01

UNKNOWN new 1 / 1

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	0 / 1

Enterprise Outlook total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	weasel.example.com	1	none	pass	fail	2026-08-03 02:00

zebu.example.com 1 / 1

100%

05-27

06-22

06-30

07-31

08-03

08-20

08-28

09-01

UNKNOWN new 1 / 1

IP	PTR	Fail / Total	DMARC failures share
85.215.255.3	mi4-p00-ob.smtp.rzone.de	0 / 1

Yahoo total 1

No DMARC failures from this reporter.

source IP	header-from	count	disposition	DKIM	SPF	report begin
85.215.255.3	zebu.example.com	1	none	pass	fail	2026-08-28 02:00