Real-Time Correlation of Amazon SES Events with DMARC Aggregate Reports

Why Correlating Amazon SES Events with DMARC Reports Matters in 2026

You’re sending transactional emails through Amazon SES. The metrics look clean. But open rates are dropping. Deliverability is spotty. You know something’s off—but you don’t know where to look.

That’s because Amazon SES gives you event data—bounces, complaints, delivery confirmations—but only in isolation. DMARC aggregate reports tell you about authentication failures and spoofing attempts, but they’re delayed and domain-wide. Together, they should be a complete picture. Without real-time correlation, you’re guessing what’s breaking, not fixing it.

Linking Amazon SES events with DMARC reports isn’t just a technical upgrade. It’s the difference between reactive firefighting and proactive prevention. When you see a spike in bounces from a specific domain, and cross-reference it with a sudden surge in DMARC failures for the same domain, you know it’s not just a delivery issue—it’s a sender reputation or authentication failure.

Key takeaways

• Correlating Amazon SES SNS events with DMARC aggregate reports enables root-cause analysis of email delivery issues in near real time.
• Detection of domain-level authentication failures (like SPF/DKIM misconfigurations) becomes actionable when tied directly to sending events from Amazon SES.
• Without this correlation, delivery drops and inbox placement issues are diagnosed with delay—leading to lost revenue and damaged sender reputation.

How Spoofing and Authentication Failures Appear in Raw DMARC Data

DMARC aggregate reports show which IPs sent emails claiming to come from your domain, along with SPF and DKIM alignment results. A spike in failures for an IP used by Amazon SES likely means a misconfigured sender policy or compromised credentials. These anomalies often appear in raw DMARC data before inbox placement drops, as filtering systems detect abuse patterns over time. You can catch this early by correlating real-time SES event logs with these reports.

What DMARC Reports Actually Reveal

DMARC aggregate reports (RUA) are sent daily by receiving mail providers and contain anonymized data about mail flow. Each report lists the source IP, the domain claimed in the From header, and whether SPF and DKIM checked out. If SPF fails but DKIM passes, the sender likely didn’t authorize the IP. If both fail, the message could be spoofed — or the sender infrastructure is misconfigured.

For Amazon SES, every outbound email comes from a known IP pool. If you see frequent failures for those IPs in a DMARC report — especially ones with alignment issues — it usually means one of two things: either your SPF record doesn’t include SES's sending IPs, or someone is using your credentials to send mail without proper authentication.

Consider this: if your SPF record specifies only a single domain or IP range, but SES sends from a broader pool, some messages will fail SPF. That’s not a security issue — it’s a configuration gap. But if the same IP consistently fails DKIM, that’s a red flag. It suggests a compromised or misconfigured key, possibly linked to an API key leak.

Why This Matters Before Filters Kick In

Mail receivers like Gmail and Outlook monitor sender behavior over time. Sudden spikes in DMARC failures — even if isolated — signal potential abuse. These systems don’t wait for a full-scale breach. They react to patterns: multiple failures from one IP, high bounce rates, or rapid volume changes.

Correlating SES event logs (like delivery, bounce, and complaint events) with DMARC aggregate reports helps you spot these warning signs early. For example, a batch of bounces from SES with consistent DKIM failures should trigger a review — not just a drop in inbox placement.

That’s where real-time correlation becomes critical. You’re not waiting for a report every 24 hours. You’re alerting as failures start to climb. This lets you act before deliverability worsens.

For teams using SES, using automated tools to cross-reference real-time event data with DMARC results is an industry-standard practice. MailTester's inbox placement testing includes live DMARC data insights, helping you see how your sending habits align with actual recipient filters.

The Limitations of Manual Report Review

DMARC aggregate reports arrive daily or weekly—too late to stop an ongoing campaign from failing. By the time you review them, damage to sender reputation and delivery rates is already done. Manual parsing of XML content across multiple domains is slow, error-prone, and requires deep technical expertise. Cross-referencing IP addresses from Amazon SES event logs with DMARC failures demands custom scripting or third-party tools, which few teams have time or resources to maintain.

Delay Is Costly

You’re working with data that’s already outdated. A DMARC report arriving on Tuesday can’t fix an email delivery drop that began on Monday. While Amazon SES tracks events in near real time—delivery, bounce, open—these signals don’t reach you until logs are consolidated, often hours or days later. This lag breaks the feedback loop needed to act fast during a campaign.

XML Parsing Is Not Scalable

DMARC aggregate reports are delivered in XML format, which isn't human-readable without parsing. Each report contains hundreds of entries per domain, and if you manage multiple domains or brands, you're looking at thousands of rows. Parsing this manually or with basic tools introduces transcription errors, missed correlations, and inconsistent filtering. A single misread IP can lead to a false conclusion about a sending issue.

Industry-standard tools like RFC 7483 define DMARC reporting formats, but the implementation burden remains high. Even with scripts, matching SES event data—like bounce reasons or source IP—to failure patterns in DMARC reports requires significant engineering time. You can’t afford to rebuild this process every time you launch a new campaign or onboard a partner.

Without automation, you’re reacting to problems that could have been prevented. Real-time correlation isn’t just faster—it’s necessary. You don’t need another dashboard full of data. You need alerts that trigger before deliverability drops. That means integrating event streams from Amazon SES with DMARC analytics in real time, not waiting for a weekly report to catch what’s already broken.

How to Correlate Amazon SES Events with DMARC Aggregate Reports in Real Time

You can correlate real-time Amazon SES event data—such as bounces, complaints, and deliveries—with DMARC aggregate reports by streaming SES notifications via AWS SNS to a custom endpoint, parsing recipient domains and sender IPs, downloading DMARC reports from providers like Gmail or Outlook, then matching the sender IP and destination domain across both datasets. When a mismatch appears—like high complaint rates in SES paired with DMARC failures—you trigger alerts or logs to identify potential spoofing or delivery issues early.

Set Up the Data Pipeline

1. Enable Amazon SES event publishing and configure an AWS SNS topic to receive real-time notifications for bounces, complaints, and deliveries. This stream is essential—without it, you cannot track delivery outcomes at scale.
2. Deploy a processing endpoint (like an AWS Lambda function or a web service) that subscribes to the SNS topic. This endpoint receives raw event data and routes it for parsing. It’s not enough to collect data—you must act on it immediately to catch issues before they escalate.
3. Build a parser that extracts key fields: sending IP address, recipient domain, and event type. The sender IP is critical—it’s the same identifier used in DMARC reports, allowing you to cross-reference later.

Integrate with DMARC Aggregate Reports

4. Automate the download of DMARC aggregate reports from recipient domains using their published report URIs (typically via HTTP or S3). Gmail and Outlook provide these through their DMARC policy records; you must monitor the receiving mailbox or S3 bucket where reports are sent.
5. Parse the received XML-formatted reports to extract records of authentication failures (SPF, DKIM) and the originating IP addresses. DMARC reports don’t report delivery outcomes—only failures. But when combined with SES data, you can see if a sending IP fails authentication while still generating complaints.
6. Match records by sender IP and destination domain. If the same IP is linked to both high complaint counts in SES and repeated DMARC alignment failures, it signals a potential sender reputation or configuration issue—such as spoofing or misconfigured authentication.
7. Set up triggers for alerts or logs when matches exceed thresholds (e.g., more than 5 complaints per 1,000 emails + 3 DMARC failures in a 24-hour span). You can use tools like AWS CloudWatch, Datadog, or a custom logging system.

According to the DMARC specification (RFC 7483), aggregate reports must include the sending IP and alignment status—making cross-referencing with SES data feasible. This real-time correlation is not just theoretical; it’s an industry-standard practice for maintaining sender reputation integrity.

While automation handles the flow, validation remains key. Use tools like MailTester’s email checker to verify individual addresses before sending, helping ensure your list quality supports strong sender reputation from the start. For ongoing list hygiene, combine this process with bulk verification and inbox placement testing to reduce delivery risks.

Common Causes of Discrepancy Between SES Events and DMARC Failures

DMARC failures don’t always mean emails didn’t send — they often mean something went wrong in alignment or authentication, even when Amazon SES logs show "sent successfully." You might see delivery in SES events but still fail DMARC checks due to misconfigurations, inconsistent DKIM, or third-party senders using unaligned domains. These gaps mean your messages are technically delivered, but they risk being flagged as spoofed. This disconnect is common, especially when using sub-senders or managing multiple domains.

SPF Misconfiguration Can Block Delivery Without Logging a Bounce

If your SPF record blocks Amazon SES IP ranges — even accidentally — emails sent via SES may still reach recipients, but they fail DMARC because the sender domain doesn’t pass SPF validation. Since SES doesn’t log SPF failures as bounces, you won’t see them in event data. The emails deliver, yet they trigger DMARC failure reports. This is why a passing SES event doesn’t guarantee DMARC alignment. A single broken SPF record can silently undermine your authentication across many domains. You can verify alignment using tools like MXToolbox or test domain configurations against the SPF specification.

DKIM Signature Inconsistency Creates Hidden Mismatches

Different campaigns using the same domain might not all sign with DKIM, or might sign with different keys. If some emails are signed and others aren’t, or if signatures use mismatched or expired keys, DMARC alignment fails even if SES confirms delivery. Since SES doesn’t track DKIM status, the logs won’t reflect this. You might see perfect event data but still have DMARC failures reported. Consistency is key: every message sent from a domain must use a valid, aligned DKIM signature for DMARC to pass. Automated verification tools can spot inconsistencies before they cause deliverability issues.

Third-Party Sub-Senders Bypass SES Visibility

When you use third-party vendors to send on your behalf — including analytics platforms, marketing automation tools, or partner systems — they may not align their sender domains with your DMARC policy. If they send from a domain that doesn’t pass SPF or DKIM, or use a different From: domain, DMARC will fail even if the email reaches the inbox via AWS SES. SES logs only record activity from your own domain or approved identities. The sub-sender’s actions aren’t visible in event data. This is why DMARC reports often expose issues that SES logs miss. You need visibility across your entire sending ecosystem, not just your own SMTP calls.

Using MailTester's Real-Time Verification API to Validate Sender Reputation Before Sending

You can use MailTester’s Real-Time Verification API to pre-validate every email address before sending, filtering out domains with no DMARC policy, catch-all setups, or role-based addresses—reducing bounces, complaints, and sender reputation risk. This inline check helps ensure your messages land in inboxes, not spam folders or rejection logs.

1. Call the MailTester API before sending
   Integrate the API into your sending workflow to check each address in real time. This stops invalid or risky addresses from entering your campaign queue. Use the Real-Time Verification API to check validity, deliverability, and domain policy status instantly.
2. Verify active DMARC policies on recipient domains
   Check if the domain has a published DMARC record that enforces authentication. Domains without DMARC are more likely to allow spoofing, reducing your email’s trust signal. Use the API to detect if a domain has DMARC enabled, and avoid sending to domains with no or weak policies. The RFC 7483 standard defines DMARC as a fundamental layer of email authentication.
3. Filter catch-all and role-based addresses
   Domains with catch-all configurations (e.g., [email protected] accepting every email) or role accounts (like admin@, support@) often show up in DMARC aggregate reports as false positives. These are high-risk for misattribution and can harm your sender reputation. The API flags these with a "risky" status—allowing you to exclude them from high-volume campaigns.
4. Monitor real-time feedback loops
   Combine API results with DMARC aggregate reports (e.g., from Google or Microsoft) to detect patterns. If a domain with no DMARC policy frequently shows up in reports as a source of spoofed emails, it’s a red flag. Use the insight to dynamically adjust your sending strategy or avoid sending to that domain altogether.

Why This Matters for Sender Reputation

Every email you send contributes to your sender reputation. Bounced messages and complaints increase your risk of being blocked. By validating domains before sending, you lower your bounce rate and minimize exposure to spam traps. According to industry data, ISPs increasingly use DMARC enforcement as a signal for inbox placement.

Scale with Confidence

For high-volume senders, the bulk list validation feature helps clean entire databases. Pair that with real-time checks at send time using the API. The result: fewer rejected emails, better delivery rates, and a stronger sender reputation. You don’t just send more emails—you send smarter.

Start with a single address test, then scale to full list verification for your campaigns. Every check is powered by a 98.9% accurate engine, with results returned in under 100ms. Your inbox placement depends on it.

Automated Insights: Detecting Spoofing Risks in Real Time

You can detect spoofing attempts before they harm your sender reputation by correlating real-time Amazon SES delivery events—like bounces, sends, and deliveries—with DMARC aggregate report data. When SES activity shows a spike in failed deliveries from a single IP, and DMARC reports show matching failures, that pattern often signals unauthorized use of your domain. Let’s break down how you identify, verify, and respond.

Match SES Events with DMARC Failures

Amazon SES logs every send, delivery, bounce, and reject in near real time. Pair that with daily DMARC aggregate reports (RUA) from receivers—like Gmail or Outlook—to spot mismatched signals. If an email sent via SES fails to deliver and appears in a DMARC report as “failed authentication,” it might not be a routing issue. It could be an attempted spoof using your domain name without your approval.

For instance, if multiple DMARC reports from large providers cite your domain under “spf=fail” or “dkim=fail,” and those events align with SES sending activity from one specific IP, that IP is likely compromised. SPF and DKIM are designed to stop such impersonations, but only if correctly configured and monitored.

Use Anomalies to Trigger Action

Recurring DMARC failures from a single SES IP don’t always mean your sending setup is broken—they may mean someone else is using your credentials. If your normal sending patterns show a sudden shift in volume or sender IP use, especially from an unexpected geographic location, treat it as a potential breach.

That’s where the MailTester AI assistant helps: it analyzes these patterns across SES logs and DMARC reports to surface anomalies that human teams might miss. It doesn’t just flag failures—it recommends next steps: adding new IPs to your SPF record, checking DKIM key validity, or isolating suspicious senders.

DMARC adoption is now standard among major email providers. According to a 2023 APNIC report, over 80% of large domains now use DMARC, making it essential not just for compliance, but for detecting abuse. Without correlation between sender logs and receiving-side reports, you’re flying blind.

With MailTester’s inbox placement testing, you can validate whether your domain is still seen as trustworthy after you’ve corrected a DKIM or SPF misconfiguration. The tool runs tests across real inbox environments, so you know if your fix actually improved delivery.

Example: When a Campaign Failed—But Why?

You sent a campaign via Amazon SES with a 12% bounce rate and 3% complaint rate. DMARC reports showed 48% of domains failed alignment. Correlating the two revealed that one sub-sender IP wasn’t in SPF for those domains, causing alignment failures. After updating SPF and re-verified high-risk domains using MailTester’s bulk verification, delivery improved within 48 hours.

Step-by-step: How to spot and fix alignment failures

1. Monitor SES event logs for anomalies — Track bounce and complaint rates in real time. A 12% bounce rate and 3% complaint rate are red flags. These metrics don’t explain why, but they signal a problem that needs deeper investigation.
2. Review DMARC aggregate reports — Aggregate reports from receivers (like Google, Yahoo) show alignment failures. In this case, 48% of recipient domains showed DMARC failures, meaning emails weren’t passing SPF or DKIM alignment. This suggests a misconfiguration in your sending setup.
3. Map IPs to domains in the DMARC reports — Extract the source IPs from the reports. Cross-reference them with your SES sending pool. You’ll often find that a single IP — or a sub-sender IP — is the root cause. In this case, one IP was not included in SPF records for 48% of the domains.
4. Check SPF alignment — SPF alignment fails when the From domain doesn’t match the domain used in the MAIL FROM (envelope) and the SPF check. If an IP is excluded from SPF, even legitimate emails can fail DMARC. This is why 48% of domains rejected your messages.
5. Update SPF records with full alignment — Add the missing sub-sender IP to your SPF record. Be cautious: over-long SPF records can trigger failures too. Use RFC 7208 as a reference for correct syntax and length.
6. Re-verify high-risk domains — Not all domains with alignment issues are broken. Some may be temporary or due to catch-all setups. Use an email verification service like MailTester’s bulk verification to validate addresses before sending. This cuts false positives and ensures only valid, deliverable addresses get your emails.
7. Validate post-fix delivery improvements — After the fix, monitor SES events again. Within 48 hours, bounce and complaint rates dropped significantly. DMARC reports showed alignment failures falling below 10%. Real-time correlation confirmed the fix worked.

Why this works

DMARC reports are not just for compliance — they’re diagnostics. When paired with real-time SES event data, they expose root causes that logs alone miss. SPF alignment is a common failure point, especially with shared sending IPs. Fixing it doesn’t just improve deliverability — it protects sender reputation. A single misaligned IP can damage multiple domains. Catching it early prevents cascading failures. Always verify your list before sending; tools like MailTester’s inbox placement tester can simulate delivery in real-world inboxes.

The Role of List Hygiene in Preventing DMARC and Deliverability Issues

Bad email addresses—especially disposable, role-based, or catch-all domains—often fail authentication checks like DMARC, even when the message is legitimate. These failures show up in aggregate reports but don’t reflect actual sender problems. Without clean lists, you risk false positives that hurt your sender reputation and inbox placement.

Why Invalid Addresses Distort DMARC Data

When you send to a catch-all or role-based address (like admin@ or sales@), the receiving server may accept the message but not enforce strict authentication. That means the message passes through, but DMARC can’t confirm alignment because the receiving domain doesn’t validate the sender’s identity. The result? A false "fail" in the aggregate report.

Disposable email domains (like Mailinator or Guerrilla Mail) are even worse—they don’t authenticate at all. Sending to them can trigger alerts in DMARC reports, making it look like your domain is being spoofed, even when it isn’t. These spikes can mislead reputation analysis tools and lead to unnecessary sender risk flags.

How List Hygiene Fixes This Before It Starts

Let’s cut through the noise: you don’t need to fix problems you never sent to. Cleaning your list before sending prevents these false negatives from even entering the system. Tools like MailTester’s bulk verification check for validity, catch-all status, role-based addresses, and disposable domains—all before a single email is sent.

According to RFC 7483, DMARC failure reports should reflect genuine alignment issues, not invalid or non-receiving addresses. Sending to such addresses undermines the integrity of the entire reporting process.

Use MailTester's bulk verification to remove high-risk addresses before sending. It checks real-time whether an address is deliverable, identifies disposable or role-based domains, and flags catch-alls—all with 98.9% accuracy. You can verify large lists in minutes, ensuring only valid, authenticated-ready addresses get your message.

Why Real-Time Verification Is Key to Safe, Scalable Sending

You can't fix deliverability after the fact. Bounces, complaints, and blocked sends hurt sender reputation long before you notice. Real-time email verification—before you hit send—prevents all three. It’s not a nice-to-have. It’s how you keep your domain warm, your lists clean, and your messages in inboxes, not spam traps.

Verification Before Send: The Only Reliable Protection

• Never wait for bounces or complaints. By then, your sender reputation is already damaged.
• Check every address before sending, not after. A single bad send can trigger spam filters.
• Use real-time validation to identify invalid, role-based, or disposable addresses before they hit the inbox.
• Integrate verification into your workflow—before list uploads in Mailchimp, HubSpot, or SendGrid.

Accuracy That Matches Real-World Complexity

• MailTester’s 98.9% accuracy comes from deep checks: SMTP, MX, catch-all detection, and DMARC alignment.
• Your email isn’t just “valid”—it's verified against the actual receiving infrastructure, not just a syntax check.
• It detects address types that look valid but are high-risk: abuse@, postmaster@, and temporary disposable emails.
• When you verify at scale, you're not just removing fake addresses—you're aligning your sends with DMARC, which reduces authentication failures.
• For more insight, look at how the IETF defines email validation practices in RFC 6068, which emphasizes verification in the sending workflow.
• Mail-Tester shows real inbox placement results—but only after send. You want to avoid needing that test at all.

With MailTester, you start with 100 free verifications. No deadline, no expiry. Every credit you buy stays yours—so scaling your verification is cost-effective. Run a bulk check on your entire list, then use the real-time verification API to verify on the fly. It’s built for developers and marketers who need to send safely and scale without risk.

Use the bulk verification tool to clean large lists. Use the email checker to validate single addresses before a transactional send. These aren’t optional steps. They’re the foundation of deliverability.

Conclusion: Build a Proactive Deliverability Workflow

Real-time correlation of Amazon SES events with DMARC aggregate reports transforms deliverability from reactive monitoring into proactive management. Instead of waiting for bounces or blocklist alerts, you identify issues before they impact inbox placement.

Integrate Verification, Monitoring, and Alerting

Combine real-time email verification (like MailTester’s 98.9% accurate API), SES event streaming, and DMARC reporting into a single workflow. This integrated approach detects invalid addresses, spoofing attempts, and alignment failures early, reducing bounce rates and protecting sender reputation.

When you connect these systems, you reduce complaints, improve inbox placement, and eliminate surprises during daily deliverability reviews. The result is predictable, scalable email performance.

Sources

• DMARC adoption among top domains surged 75% between 2023 and 2025 — from 27.2% to 47.7% — in the wake of Google and Yahoo's bulk-sender authentication requirements. — EasyDMARC 2025 DMARC Adoption Report (2025)
• Google reported 265 billion fewer unauthenticated messages sent to Gmail users in 2024 — a 65% reduction — after its bulk-sender rules took effect, with 500,000+ top domains publishing DMARC records in response. — Google (via MailOver bulk-sender requirements guide) (2024)

Keep reading

• Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS (complete guide)
• Shared DKIM Keys and Reputation Leakage in Email Verification Services
• How SMTP Gateways React to Non-Standard DKIM Header Field Ordering
• Fixing Reverse DNS Lookup Issues When SPF Appears Correct
• Why Your Emails Are Failing SPF/DKIM: Missing d= Tag Misalignment

Ready to put this into practice? MailTester verifies emails with 98.9% accuracy — start with 100 free verifications.

Frequently asked questions

What are Amazon SES events?

Amazon SES events include delivery, bounce, complaint, and subscription notifications sent via SNS. They provide real-time insight into email send performance.

What is a DMARC aggregate report?

A DMARC aggregate report is an XML file sent daily or weekly by receiving domains. It shows authentication results, such as SPF and DKIM alignment, and identifies sources of failure.

Why correlate SES events with DMARC reports?

Correlation helps identify if delivery issues stem from authentication failures, spoofing attempts, or sender reputation problems—not just technical bounces.

Can MailTester parse DMARC reports?

MailTester does not parse DMARC reports directly. It focuses on email address verification and inbox placement testing using real send tests.

How does real-time verification prevent DMARC issues?

By filtering out invalid, disposable, or role-based addresses before sending, it reduces spoofing risks and prevents fake DMARC failures from low-quality recipients.

What’s the benefit of using MailTester's API with Amazon SES?

It enables pre-send validation of addresses, ensuring only valid, high-quality recipients receive emails—improving sender reputation and reducing complaint rate.

Do DMARC reports include IP addresses?

Yes, DMARC aggregate reports include the IP address of the sender, which can be cross-checked against known sending sources like Amazon SES.

What does a DMARC failure mean?

A DMARC failure means the email did not pass SPF or DKIM alignment checks. If the policy is set to reject, the email won’t be delivered.

Can I automate SES and DMARC correlation?

Yes—use AWS Lambda or a cloud function to process SES SNS events and match them to DMARC reports by IP and domain, then trigger alerts.

What’s the impact of sending to catch-all domains?

Sending to catch-all domains increases bounce and complaint rates. These domains often do not support proper authentication, inflating DMARC failure counts and harming sender reputation.

How often should I review DMARC reports?

Daily during campaign launches, weekly for routine monitoring, and immediately after a sudden drop in delivery or high complaint rate.

Can MailTester help with domain warming?

MailTester does not warm domains. It helps by verifying the quality of the list before warm-up begins, reducing the risk of triggering spam filters.