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dmarc poc

DMARC aggregate report viewer (proof of concept)

schlittermann.de
EN | DE
clear
records
12
parse errors
1
unique source IPs
1
report date range
2026-05-27 — 2026-10-11 02:00:00

Top 10 source IPs

networkcount
STRATO-RZG-KA-SWH 12

Top 10 header-from domains

domaincount
vole.example.com 5
iguana.example.com 2
yak.example.com 2
zebu.example.com 2
ferret.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
vole.example.com 5
100%
UNKNOWN total 5
IP PTR Total DMARC failures share
85.215.255.3 mi4-p00-ob.smtp.rzone.de 5
google.com total 5

No DMARC failures from this reporter.

source IPheader-fromcount dispositionDKIMSPFreport begin
85.215.255.3 vole.example.com 1 none pass fail 2026-10-05 02:00
85.215.255.3 vole.example.com 1 none pass fail 2026-10-09 02:00
85.215.255.3 vole.example.com 1 none pass fail 2026-06-22 02:00
85.215.255.3 vole.example.com 1 none pass fail 2026-06-30 02:00
85.215.255.3 vole.example.com 1 none pass fail 2026-05-27 02:00
iguana.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 IPheader-fromcount dispositionDKIMSPFreport begin
85.215.255.3 iguana.example.com 1 none pass fail 2026-09-01 02:00
Outlook.com total 1

No DMARC failures from this reporter.

source IPheader-fromcount dispositionDKIMSPFreport begin
85.215.255.3 iguana.example.com 1 none pass fail 2026-08-20 02:00
yak.example.com 2
100%
UNKNOWN total 2
IP PTR Total DMARC failures share
85.215.255.3 mi4-p00-ob.smtp.rzone.de 2
Yahoo total 1

No DMARC failures from this reporter.

source IPheader-fromcount dispositionDKIMSPFreport begin
85.215.255.3 yak.example.com 1 none pass fail 2026-08-28 02:00
google.com total 1

No DMARC failures from this reporter.

source IPheader-fromcount dispositionDKIMSPFreport begin
85.215.255.3 yak.example.com 1 none pass fail 2026-09-20 02:00
zebu.example.com 2
100%
UNKNOWN total 2
IP PTR Total DMARC failures share
85.215.255.3 mi4-p00-ob.smtp.rzone.de 2
google.com total 2

No DMARC failures from this reporter.

source IPheader-fromcount dispositionDKIMSPFreport begin
85.215.255.3 zebu.example.com 1 none pass fail 2026-10-11 02:00
85.215.255.3 zebu.example.com 1 none pass fail 2026-07-31 02:00
ferret.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 IPheader-fromcount dispositionDKIMSPFreport begin
85.215.255.3 ferret.example.com 1 none pass fail 2026-08-03 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
vole.example.com 5 / 5
100%
UNKNOWN 5 / 5
IP PTR Fail / Total DMARC failures share
85.215.255.3 mi4-p00-ob.smtp.rzone.de 5 / 5

DKIM-only — SPF not aligned

google.com total 5

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3vole.example.com1none pass fail 2026-10-05 02:00
85.215.255.3vole.example.com1none pass fail 2026-10-09 02:00
85.215.255.3vole.example.com1none pass fail 2026-06-22 02:00
85.215.255.3vole.example.com1none pass fail 2026-06-30 02:00
85.215.255.3vole.example.com1none pass fail 2026-05-27 02:00
iguana.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 IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3iguana.example.com1none pass fail 2026-09-01 02:00
Outlook.com total 1

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3iguana.example.com1none pass fail 2026-08-20 02:00
yak.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

Yahoo total 1

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3yak.example.com1none pass fail 2026-08-28 02:00
google.com total 1

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3yak.example.com1none pass fail 2026-09-20 02:00
zebu.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

google.com total 2

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3zebu.example.com1none pass fail 2026-10-11 02:00
85.215.255.3zebu.example.com1none pass fail 2026-07-31 02:00
ferret.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 IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3ferret.example.com1none pass fail 2026-08-03 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
09-20
10-05
10-09
10-11
vole.example.com 5 / 5
100%
05-27
06-22
06-30
07-31
08-03
08-20
08-28
09-01
09-20
10-05
10-09
10-11
UNKNOWN new 5 / 5
IP PTR Fail / Total DMARC failures share
85.215.255.3 mi4-p00-ob.smtp.rzone.de 0 / 5
google.com total 5

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3vole.example.com1none pass fail 2026-10-05 02:00
85.215.255.3vole.example.com1none pass fail 2026-10-09 02:00
85.215.255.3vole.example.com1none pass fail 2026-06-22 02:00
85.215.255.3vole.example.com1none pass fail 2026-06-30 02:00
85.215.255.3vole.example.com1none pass fail 2026-05-27 02:00
iguana.example.com 2 / 2
100%
05-27
06-22
06-30
07-31
08-03
08-20
08-28
09-01
09-20
10-05
10-09
10-11
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 IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3iguana.example.com1none pass fail 2026-09-01 02:00
Outlook.com total 1

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3iguana.example.com1none pass fail 2026-08-20 02:00
yak.example.com 2 / 2
100%
05-27
06-22
06-30
07-31
08-03
08-20
08-28
09-01
09-20
10-05
10-09
10-11
UNKNOWN new 2 / 2
IP PTR Fail / Total DMARC failures share
85.215.255.3 mi4-p00-ob.smtp.rzone.de 0 / 2
Yahoo total 1

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3yak.example.com1none pass fail 2026-08-28 02:00
google.com total 1

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3yak.example.com1none pass fail 2026-09-20 02:00
zebu.example.com 2 / 2
100%
05-27
06-22
06-30
07-31
08-03
08-20
08-28
09-01
09-20
10-05
10-09
10-11
UNKNOWN new 2 / 2
IP PTR Fail / Total DMARC failures share
85.215.255.3 mi4-p00-ob.smtp.rzone.de 0 / 2
google.com total 2

No DMARC failures from this reporter.

source IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3zebu.example.com1none pass fail 2026-10-11 02:00
85.215.255.3zebu.example.com1none pass fail 2026-07-31 02:00
ferret.example.com 1 / 1
100%
05-27
06-22
06-30
07-31
08-03
08-20
08-28
09-01
09-20
10-05
10-09
10-11
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 IPheader-fromcountdispositionDKIMSPFreport begin
85.215.255.3ferret.example.com1none pass fail 2026-08-03 02:00