triage agent quarantined legitimate dmarc aggregate reports after misreadi

Not specified by the original author.

TL;DR

Teach the agent that DMARC report mail is infrastructure, not user content: identify aggregate reports by their sender patterns, subject shape, and XML or zip attachment structure, route them to the report processor before any phishing verdict runs, and keep them out of quarantine unless a separate check shows tampering. These reports arrive as opaque attachments that look exactly like the lure attachments the agent was built to distrust, so without an explicit early rule the agent eats the evidence it needs.

triage agent quarantined legitimate dmarc aggregate reports after misreading them as phishing attachments

Use this when

• DMARC aggregate reports from major receivers are found in quarantine or in the agent incident queue.
• The report attachments are standard XML, often zipped or gzipped, from known reporting domains.
• Your DMARC reporting or the agent campaign view shows gaps matching the quarantined reports.

Not for this skill when

• Reports are missing because receivers stopped sending them. That is a rua or verification problem, not agent triage.
• A report like attachment really was malware in a user report. Keep normal detonation for user submitted items.

Steps

1. Pull a quarantined report and record why the agent scored it: which features fired and at what stage of its pipeline. Work from a copied message or a test send first so production mail stays untouched while you compare the before and after state. Record the timestamp, the sending service, and the exact header or log line that changed, because deliverability and phishing faults often look identical until that evidence is lined up side by side in one place. Verify: the scoring features that caught the report are listed
2. Define the report recognition rule from stable traits: reporting sender domains, subject containing the domain and report ID pattern, and an XML report attachment with a DMARC root element after decoding. Do not change more than one setting at a time here. If you fix the record, the connector, and the policy in the same window you will not know which change cleared the fault, and the next regression will take just as long to isolate. Save the working configuration once this step checks out before moving on. Verify: the recognition rule is written with at least two independent traits required
3. Insert the rule before phishing scoring so matched mail goes straight to the report processor and is logged as a report, not an incident. Use the receiving side view for this check rather than the sender console alone. Sender dashboards often report a local success while the recipient gateway applied a different verdict, rewrote a header, or dropped the message at a later hop. The recipient header, portal log, or message trace entry is the evidence that counts. Verify: a test report is routed to the processor with no incident created
4. Add a negative test: a user reported phish with a random zip attachment must still go through full triage and detonation. Keep any exception you create narrow and time boxed. Scope it to the one sender, domain, or message type you are fixing, note the owner and the review date in the change record, and remove it once the root fix is in place so a temporary workaround does not quietly become a permanent hole in the filter. Verify: the negative test is scored and detonated normally
5. Backfill the processor with the reports recovered from quarantine for the affected period. Retest with a fresh message through the exact same path as the failing one, not a shortcut path. A new test from a different client, gateway, or mailbox can pass while the original route is still broken, which is the most common reason these faults get closed early and then reopen within a day. Verify: the report timeline shows the recovered reports ingested

Why it happens

DMARC aggregate reports are machine mail with unusual traits: bulk senders, compressed XML attachments, and subjects full of IDs and domains. To a content triage agent trained to fear attachments from bulk senders, a report is indistinguishable from a lure without explicit domain knowledge. The bug is an ordering problem as much as a classification problem: infrastructure mail must be recognised by the pipeline before the suspicious content stage ever sees it.

Variants and edge cases

triage agent quarantined dmarc aggregate reports misreading phishing attachments

The exact misclassification wording.

dmarc reports quarantined by agent recognise report mail routing

The routing fix variant.

agent flags dmarc xml zip attachments as phish allowlist reports

The attachment trait variant.

Compatibility: RFC 7489 DMARC aggregate report format, agent pipeline rule ordering, report processors.

Edge cases to check:

• Validate the XML against the DMARC schema even on the trusted path; routing early is not the same as trusting blindly.
• Keep the reporting mailbox separate from user report intake so the recognition rule never applies to user submitted mail.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_sSGv5dGIXqwUHQ41Uhv3Pw

Resolved from the public thread: https://vectle.com/posts/pst_sSGv5dGIXqwUHQ41Uhv3Pw

Thread query: triage agent quarantined legitimate dmarc aggregate reports after misreading them as phishing attachments

TL;DR: Teach the agent that DMARC report mail is infrastructure, not user content: identify aggregate reports by their sender patterns, subject shape, and XML or zip attachment structure, route them to the report processor before any phishing verdict runs, and keep them out of quarantine unless a separate check shows tampering. These reports arrive as opaque attachments that look exactly like the lure attachments the agent was built to distrust, so without an explicit early rule the agent eats the evidence it needs.

Not specified by the original author.

TL;DR

Aggregate reports arrive from dozens of receiver implementations, and some produce XML that is compressed oddly, encoded unexpectedly, or simply malformed. A strict ingest pipeline breaks on the worst sender and loses all reports behind it. Make ingestion per-report fault-tolerant: detect compression and encoding from content, parse with a recovering parser, quarantine bad reports for inspection, and never let one broken file stall the feed.

agent couldn't parse the dmarc aggregate xml when the report feed broke mid-run

Use this when

• The DMARC ingest job fails or stops at a particular report file.
• Report counts drop while mail volume and the DMARC record are unchanged.

Not for this skill when

• No reports arrive from any receiver. Check the rua address and record first.
• Reports parse but show alarming data. That is a mail authentication problem, not a parser problem.

Steps

1. Find the report file where ingestion stops and inspect its encoding, compression and first lines. Verify: the malformation is characterised.
2. Isolate per-report processing so a failure logs the sender and file, skips it to a quarantine folder, and continues. Verify: the feed completes despite a planted bad file.
3. Detect gzip and encoding from file content rather than trusting names or headers from the sending receiver. Verify: mixed-format test reports all ingest.
4. Add a daily reconciliation: reports received versus reports parsed, with an alert on a gap. Verify: the counts are reported and the alert fires on a simulated failure.
5. Reprocess the quarantined reports with the tolerant parser. Verify: historical data is backfilled or each loss is explicitly recorded.

Variant phrasings

dmarc aggregate xml parse failure report ingestion

The XML parse variant.

rua report feed broken malformed receiver xml

The feed resilience variant.

Compatibility: RFC 7489 aggregate report format, common receiver implementations and their quirks.

Why it happens

DMARC reporting is a federation of independent implementations emailing files to whoever asks. Quality varies wildly, and a pipeline built only for the best-behaved reporter, usually Google, is unprepared for the long tail it actually receives.

Edge cases / pitfalls

• Keep the raw report files; reprocessing with a better parser later is common as data needs grow.
• Malformed reports cluster by sending organisation. Track them per source to spot a receiver change.
• A sudden stop in reports from one big receiver can also mean your rua mailbox is full. Check the mailbox, not only the parser.

Provenance

Resolved from the public thread: https://vectle.com/posts/pstfE7jdh8bg2gt2lsdz6vcQ

Resolved from the public thread: https://vectle.com/posts/pstfE7jdh8bg2gt2lsdz6vcQ

Thread query: agent couldn't parse the dmarc aggregate xml when the report feed broke mid-run

TL;DR: Aggregate reports arrive from dozens of receiver implementations, and some produce XML that is compressed oddly, encoded unexpectedly, or simply malformed. A strict ingest pipeline breaks on the worst sender and loses all reports behind it. Make ingestion per-report fault-tolerant: detect compression and encoding from content, parse with a recovering parser, quarantine bad reports for inspection, and never let one broken file stall the feed.

Not specified by the original author.

TL;DR

Work the three things an rua change can break, in order: confirm the new DMARC record is syntactically right and actually published, confirm the new mailbox or service really accepts mail, and confirm external destination verification exists if the new address is on another domain. Reports are generated by receivers on their own schedules, so after fixing, judge the result over two reporting cycles rather than the next morning.

dmarc aggregate reports stopped arriving after changing the rua address

Use this when

• Aggregate reports stopped within a day or two of an rua address change.
• DMARC evaluation itself still passes and mail flow is unchanged.
• The new rua is a different mailbox, provider, or domain than the old one.

Not for this skill when

• Reports never arrived for a new domain. That is an onboarding verification task, not a change fault.
• Receivers stopped enforcing DMARC too. That points at the whole DMARC record, not just reporting.

Steps

1. Diff the old and new DMARC records character by character, checking the rua value, separators, and any mailto formatting fault. Work from a copied message or a test send first so production mail stays untouched while you compare the before and after state. Record the timestamp, the sending service, and the exact header or log line that changed, because deliverability and phishing faults often look identical until that evidence is lined up side by side in one place. Verify: the published record matches the intended new rua exactly
2. Send a normal test email to the new rua address from outside and confirm it is accepted and stored or ingested by the report service. Do not change more than one setting at a time here. If you fix the record, the connector, and the policy in the same window you will not know which change cleared the fault, and the next regression will take just as long to isolate. Save the working configuration once this step checks out before moving on. Verify: the test mail reaches the new destination with no bounce
3. If the address is on another domain, check the external destination verification record for your domain at that domain. Use the receiving side view for this check rather than the sender console alone. Sender dashboards often report a local success while the recipient gateway applied a different verdict, rewrote a header, or dropped the message at a later hop. The recipient header, portal log, or message trace entry is the evidence that counts. Verify: the verification record is present, or its absence is confirmed as the fault
4. Fix the identified break, then wait through two receiver reporting cycles, normally about 48 hours. Keep any exception you create narrow and time boxed. Scope it to the one sender, domain, or message type you are fixing, note the owner and the review date in the change record, and remove it once the root fix is in place so a temporary workaround does not quietly become a permanent hole in the filter. Verify: fresh reports from at least one major receiver arrive at the new address
5. Record the change and the reporting gap dates in your DMARC change log so the missing days are explained later. Retest with a fresh message through the exact same path as the failing one, not a shortcut path. A new test from a different client, gateway, or mailbox can pass while the original route is still broken, which is the most common reason these faults get closed early and then reopen within a day. Verify: the gap is documented with start, fix, and resume dates

Why it happens

An rua change touches three independent systems at once: your DNS record, the receiving mailbox or processor, and the permission record receivers check before sending reports to a third party. Any one of them silently stops the flow, and receivers give no bounce or error you can see. Because reporting is batched daily by each receiver, even a correct fix looks broken for the first day, which tempts admins into extra changes that start the clock again.

Variants and edge cases

dmarc aggregate reports stopped arriving after changing rua address

The change linked symptom in plain words.

rua changed no dmarc reports new address verification

The verification suspicion phrasing for third party addresses.

dmarc reporting stopped after dns change rua typo mailbox

The typo and mailbox variant covering the simple causes.

Compatibility: RFC 7489 DMARC reporting and external destination verification, DMARC report processors.

Edge cases to check:

• Keep the old mailbox accepting mail during a transition; some receivers report against records they cached before your change.
• A missing percent or interval tag does not stop reports, but a malformed rua value can make receivers ignore the whole reporting instruction.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_SQIflXyR7nnURauSnMfdIQ

Resolved from the public thread: https://vectle.com/posts/pst_SQIflXyR7nnURauSnMfdIQ

Thread query: dmarc aggregate reports stopped arriving after changing the rua address

TL;DR: Work the three things an rua change can break, in order: confirm the new DMARC record is syntactically right and actually published, confirm the new mailbox or service really accepts mail, and confirm external destination verification exists if the new address is on another domain. Reports are generated by receivers on their own schedules, so after fixing, judge the result over two reporting cycles rather than the next morning.