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dmarc poc

DMARC aggregate report viewer (proof of concept)

schlittermann.de
EN | DE
clear
records
46
parse errors
1
unique source IPs
1
report date range
2026-04-01 — 2026-07-08 02:00:00

Top 10 source IPs

networkcount
UK-MICROSOFT-20060601 80

Top 10 header-from domains

domaincount
tapir.example.com 80

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
tapir.example.com 80
81% 19%
UK-MICROSOFT-20060601 total 80
IP PTR Total DMARC failures share
2a01:111:f403:c408::3 mail-centralindiaazlp170110003.outbound.protection.outlook.com 80
Enterprise Outlook total 80

Top 10 failing source IPs

countsource IPPTR
15 2a01:111:f403:c408::3ⓘ
domaindispdkimspf#
tapir.example.comrejectfailfail15
 		mail-centralindiaazlp170110003.outbound.protection.outlook.com
source IPheader-fromcount dispositionDKIMSPFreport begin
2a01:111:f403:c408::3 tapir.example.com 4 none pass fail 2026-04-01 02:00
2a01:111:f403:c408::3 tapir.example.com 2 reject fail fail 2026-04-01 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-04-02 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-04-07 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-04-07 02:00
2a01:111:f403:c408::3 tapir.example.com 3 none pass fail 2026-04-08 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-04-08 02:00
2a01:111:f403:c408::3 tapir.example.com 5 none pass fail 2026-04-09 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-04-09 02:00
2a01:111:f403:c408::3 tapir.example.com 7 none pass fail 2026-04-13 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-04-13 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-04-13 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-04-13 02:00
2a01:111:f403:c408::3 tapir.example.com 4 none pass fail 2026-04-15 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-04-16 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-04-22 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-04-23 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-04-23 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-04-29 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-04-29 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-05-05 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-05-07 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-05-07 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-05-11 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-05-11 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-05-12 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-05-18 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-05-18 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-05-18 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-05-19 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-05-19 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-05-20 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-05-21 02:00
2a01:111:f403:c408::3 tapir.example.com 4 none pass fail 2026-05-26 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-05-27 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-05-27 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-05-28 02:00
2a01:111:f403:c408::3 tapir.example.com 3 none pass fail 2026-06-15 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-06-24 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-06-29 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-06-30 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-07-02 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-07-06 02:00
2a01:111:f403:c408::3 tapir.example.com 1 reject fail fail 2026-07-06 02:00
2a01:111:f403:c408::3 tapir.example.com 2 none pass fail 2026-07-07 02:00
2a01:111:f403:c408::3 tapir.example.com 1 none pass fail 2026-07-08 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
tapir.example.com 80 / 80
81% 19%
UK-MICROSOFT-20060601 80 / 80
IP PTR Fail / Total DMARC failures share
2a01:111:f403:c408::3 mail-centralindiaazlp170110003.outbound.protection.outlook.com 80 / 80

inconsistent — some records fail

Enterprise Outlook total 80

Top 10 failing source IPs

countsource IPPTR
15 2a01:111:f403:c408::3ⓘ
domaindispdkimspf#
tapir.example.comrejectfailfail15
 mail-centralindiaazlp170110003.outbound.protection.outlook.com
source IPheader-fromcountdispositionDKIMSPFreport begin
2a01:111:f403:c408::3tapir.example.com4none pass fail 2026-04-01 02:00
2a01:111:f403:c408::3tapir.example.com2reject fail fail 2026-04-01 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-04-02 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-04-07 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-07 02:00
2a01:111:f403:c408::3tapir.example.com3none pass fail 2026-04-08 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-08 02:00
2a01:111:f403:c408::3tapir.example.com5none pass fail 2026-04-09 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-04-09 02:00
2a01:111:f403:c408::3tapir.example.com7none pass fail 2026-04-13 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-04-13 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-13 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-13 02:00
2a01:111:f403:c408::3tapir.example.com4none pass fail 2026-04-15 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-04-16 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-22 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-04-23 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-04-23 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-04-29 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-29 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-05-05 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-07 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-07 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-11 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-11 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-12 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-18 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-18 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-18 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-19 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-19 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-20 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-21 02:00
2a01:111:f403:c408::3tapir.example.com4none pass fail 2026-05-26 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-27 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-27 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-05-28 02:00
2a01:111:f403:c408::3tapir.example.com3none pass fail 2026-06-15 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-06-24 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-06-29 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-06-30 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-07-02 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-07-06 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-07-06 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-07-07 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-07-08 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
04-01
04-02
04-07
04-08
04-09
04-13
04-15
04-16
04-22
04-23
04-29
05-05
05-07
05-11
05-12
05-18
05-19
05-20
05-21
05-26
05-27
05-28
06-15
06-24
06-29
06-30
07-02
07-06
07-07
07-08
tapir.example.com 80 / 80
81% 19%
04-01
04-02
04-07
04-08
04-09
04-13
04-15
04-16
04-22
04-23
04-29
05-05
05-07
05-11
05-12
05-18
05-19
05-20
05-21
05-26
05-27
05-28
06-15
06-24
06-29
06-30
07-02
07-06
07-07
07-08
UK-MICROSOFT-20060601 new failing 80 / 80
IP PTR Fail / Total DMARC failures share
2a01:111:f403:c408::3 mail-centralindiaazlp170110003.outbound.protection.outlook.com 15 / 80
Enterprise Outlook total 80

Top 10 failing source IPs

countsource IPPTR
15 2a01:111:f403:c408::3ⓘ
domaindispdkimspf#
tapir.example.comrejectfailfail15
 mail-centralindiaazlp170110003.outbound.protection.outlook.com
source IPheader-fromcountdispositionDKIMSPFreport begin
2a01:111:f403:c408::3tapir.example.com4none pass fail 2026-04-01 02:00
2a01:111:f403:c408::3tapir.example.com2reject fail fail 2026-04-01 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-04-02 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-04-07 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-07 02:00
2a01:111:f403:c408::3tapir.example.com3none pass fail 2026-04-08 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-08 02:00
2a01:111:f403:c408::3tapir.example.com5none pass fail 2026-04-09 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-04-09 02:00
2a01:111:f403:c408::3tapir.example.com7none pass fail 2026-04-13 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-04-13 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-13 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-13 02:00
2a01:111:f403:c408::3tapir.example.com4none pass fail 2026-04-15 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-04-16 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-22 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-04-23 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-04-23 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-04-29 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-04-29 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-05-05 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-07 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-07 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-11 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-11 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-12 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-18 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-18 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-18 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-19 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-19 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-20 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-21 02:00
2a01:111:f403:c408::3tapir.example.com4none pass fail 2026-05-26 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-05-27 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-05-27 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-05-28 02:00
2a01:111:f403:c408::3tapir.example.com3none pass fail 2026-06-15 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-06-24 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-06-29 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-06-30 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-07-02 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-07-06 02:00
2a01:111:f403:c408::3tapir.example.com1reject fail fail 2026-07-06 02:00
2a01:111:f403:c408::3tapir.example.com2none pass fail 2026-07-07 02:00
2a01:111:f403:c408::3tapir.example.com1none pass fail 2026-07-08 02:00