How to recover domain reputation after SES credentials were stolen?
Matthew Whittaker
Co-founder & CTO, Suped
Published 25 Apr 2025
Updated 28 May 2026
8 min read
Summarize with
To recover domain reputation after SES credentials were stolen, first prove the abuse has stopped, then rebuild trust through clean authentication, reduced volume, engaged recipients, low complaints, and steady sending. There is no reputation reset button at Gmail or Hotmail. The fastest path is disciplined containment and a conservative rewarm.
If the compromise was fixed three weeks ago and the sender has only made two or three weekly sends since then, that is still early. I would expect recovery to take several more clean sends, and longer if the stolen SES credentials sent high-volume credential theft mail, hit spam traps, or drove complaints.
- Containment: Delete the stolen SES SMTP credentials, rotate the underlying IAM access keys, and close the WordPress entry point.
- Proof: Confirm there are no unknown SES sends, no unusual bounce spikes, and no fresh DMARC failures.
- Rewarm: Send first to recent openers and clickers, then expand by engagement age after each clean send.
- Reader signals: Use web, social, and account channels to ask real subscribers to find the email and mark it as not spam.
First contain the SES incident
Treat stolen SES credentials as an active security incident, not only a deliverability issue. SES SMTP credentials are derived from IAM credentials, so deleting a plugin password is not enough. The sender needs to remove the abused access path, rotate every affected credential, and check whether other keys were exposed by the same WordPress plugin or hosting account.
I also check SES reputation messages for AWS-side warnings, then compare that with mailbox placement at Gmail and Hotmail. AWS reputation status and mailbox provider reputation are separate signals. Passing one does not prove the other has recovered.
- Rotate keys: Disable and delete the stolen IAM access keys, generate new SES SMTP credentials, and remove old secrets from code, plugins, and backups.
- Fix WordPress: Patch or remove the vulnerable plugin, check admin accounts, scan for web shells, and rotate CMS, hosting, and database passwords.
- Audit SES: Review send volume, complaint rate, bounce rate, configuration sets, CloudTrail events, sending identities, and suppression events.
- Limit access: Use least-privilege IAM policies, MFA, separate production credentials, and alerts for volume spikes or new credential use.
- Document scope: Record the abuse dates, volume, sending IPs, subject patterns, complaint spikes, and the first clean send after remediation.
Do not rewarm on an uncertain stack
If any compromised credential, plugin, cron job, or hidden admin account remains active, every recovery send becomes new evidence against the domain. I pause nonessential mail until the sender can prove the account is clean.
Check authentication before warming
Domain reputation recovery needs consistent identity. Gmail and Hotmail should see the same visible From domain, matching DKIM domain, valid SPF, and a DMARC record that collects reports. In Suped, the domain health checker is useful for confirming the basic DNS state before sending again.
For SES, I want Easy DKIM or BYODKIM working, SPF authorizing SES for the envelope sender, and DMARC reporting turned on. A custom MAIL FROM domain is also helpful because it keeps SPF identity clean and makes bounce handling easier to reason about.
Baseline DNS records after SES cleanupDNS
v=spf1 include:amazonses.com -all v=DMARC1; p=none; rua=mailto:dmarc@example.com; fo=1 v=DMARC1; p=quarantine; pct=25; rua=mailto:dmarc@example.com
Authentication is necessary, not sufficient
SPF, DKIM, and DMARC do not erase abusive mail that already happened. They make the recovery sends easier to trust and help prove that new bad mail is not still leaving through the same domain.
Use a controlled recovery send plan
The recovery plan should look boring. Keep the same From name, same domain, same newsletter format, same cadence, and a much smaller audience. For a 40,000-person weekly magazine list, I would start with subscribers who engaged in the last 30 days, then add older engagement groups only after Gmail and Hotmail placement improves.
Risky recovery pattern
- Full list: Sending to all 40,000 subscribers before mailbox providers see clean engagement.
- New creative: Changing templates, domains, link patterns, or subject style during recovery.
- Mixed intent: Combining apology, promotion, surveys, and normal editorial mail in one send.
Stronger recovery pattern
- Engaged first: Start with recent openers, clickers, paid members, and direct replies.
- Stable identity: Use the normal newsletter domain, DKIM identity, cadence, and editorial format.
- Clear gate: Expand only when spam placement, complaints, and bounces stay low.
Example recovery volume cap
A cautious rewarm for a weekly sender after SES credential abuse.
Share of normal list
These percentages are not a fixed rule. If Gmail or Hotmail spam placement gets worse, hold the current segment or reduce volume. If complaints rise, stop the campaign and tighten the audience again.
Rebuild Gmail and Hotmail trust
Gmail and Hotmail recover when recent mail from the domain gets good recipient behavior. That means opens, clicks, replies, moves out of spam, low delete-without-read behavior, low complaints, low hard bounces, and consistent authentication. A guide on why domain reputation drops is useful background, but after stolen SES credentials the practical fix is a proof-based rewarm.
- Use strongest cohorts: Start with Gmail and Hotmail subscribers who opened, clicked, paid, logged in, or replied recently.
- Ask outside email: Post a clear notice on the website, app, and social channels asking readers to find the newsletter and mark it as not spam.
- Lower complaint risk: Avoid broad promotions, aggressive subject lines, stale subscribers, and sudden frequency changes during the rewarm.
- Prune hard: Suppress recent bounces, complainers, role accounts, long-inactive addresses, and contacts collected without clear consent.
Amazon SES reputation metrics screen showing bounce and complaint status.
The outside-channel request is not cosmetic. Real subscribers rescuing messages from spam gives Gmail and Hotmail positive mailbox-level evidence. It also gives the sender something productive to do while the email stream stays conservative.
Measure with real test messages
Do not rely only on aggregate opens. Send real messages through the same SES identity, same template, same links, and same authentication path. Then inspect headers, authentication results, content signals, and spam placement with the email tester before expanding the next cohort.
Email tester
Send a real email to this address. Suped opens the report when the test is ready.
?/43tests passed
Preparing test address...
I want tests that match production mail. A plain one-line test proves little if the newsletter has images, tracking links, a custom MAIL FROM domain, and personalization. The closer the test is to the real weekly article send, the more useful the result is.
|
|
|
|---|---|---|
DMARC | Matching | Continue |
DKIM | Passing | Continue |
Complaints | Low | Expand |
Spam | Falling | Hold |
Bounces | Low | Expand |
Signals to check before each volume increase.
Watch blocklists and blacklist fallout
Crypto credential theft campaigns often leave domain and IP traces on a blocklist or blacklist. A listing does not explain every Gmail or Hotmail spam placement, but it is a signal worth removing before volume increases. Suped's blocklist monitoring helps track domain and IP listings beside DMARC, SPF, and DKIM data.
If the sending domain, tracked links, or SES sending IPs appear on a major blacklist, I review the listing reason, confirm the abuse has stopped, and request delisting only after the technical fix is complete. Premature delisting requests fail when the same abuse resumes.
Complaint rate guardrails
Use complaint rate as a hard gate during recovery.
Good
Under 0.1%
Keep sending to the current cohort.
Caution
0.1% to 0.3%
Hold volume and review content.
Stop
Over 0.3%
Pause and suppress risky segments.
Where Suped fits
Suped's product fits the recovery workflow by keeping the sender focused on evidence, not guesswork. The practical value is having DMARC, SPF, DKIM, blocklist, and deliverability signals in one place, with real-time alerts when failures or suspicious sources appear again.
For this type of incident, I use Suped's DMARC monitoring to confirm which sources are legitimate, find new authentication failures, and move policy in stages after normal mail is stable.
Issue steps to fix dialog showing the issue overview, tailored fix steps, and verification action
Suped is the strongest practical choice for most teams because it turns recovery into a checklist: identify the source, fix the record or sender, verify the change, and watch for recurrence. Hosted SPF, hosted DMARC, hosted MTA-STS, SPF flattening, alerts, and MSP dashboards help when multiple domains or clients need the same control.
Timeline and decision rules
After stolen SES credentials, I usually set expectations in sends, not days. A weekly sender that has sent only two or three clean campaigns has not produced much new evidence. A sender with high daily volume can generate clean signals faster, but only if the list quality is strong.
|
|
|
|---|---|---|
Week 1 | Best users | Verify |
Week 2 | Recent users | Hold |
Week 3 | Warm users | Expand |
Week 4 | More users | Review |
Week 6 | Normal list | Resume |
Recovery pacing for a weekly publisher.
A simple expansion rule
Increase volume only after two clean sends to the current cohort. Clean means authenticated, low bounce, low complaint, stable open behavior, and no worsening spam placement at Gmail or Hotmail.
Views from the trenches
Best practices
Keep early recovery sends limited to readers with recent, measurable positive engagement.
Use owned channels to explain the incident and ask subscribers to rescue mail from spam.
Track recovery by clean sends and mailbox behavior, not by the number of calendar days.
Common pitfalls
Sending the full list too soon makes the compromise look like an unresolved pattern.
Changing domains, templates, or links during recovery adds noise to reputation signals.
Requesting delisting before fixing the abused path wastes review attempts and time.
Expert tips
Separate containment evidence from rewarm metrics so decisions stay clear and calm.
Give impatient stakeholders a visible off-email task that supports positive signals.
Hold volume steady after a weak send instead of trying to outrun spam placement.
Marketer from Email Geeks says three weeks is early when a weekly sender has only made two or three clean sends after the incident.
2024-07-24 - Email Geeks
Marketer from Email Geeks says owned channels can help by asking real readers to find the newsletter and mark it as not spam.
2024-07-24 - Email Geeks
Practical bottom line
The right answer is patience, but not passive waiting. The sender should prove SES is secure, keep authentication clean, send only to engaged subscribers, use non-email channels to generate positive mailbox actions, and expand volume only after clean sends.
For a weekly publisher, three weeks is not enough evidence to declare the domain recovered or permanently damaged. Six to eight disciplined sends is a more realistic planning window, with faster progress when subscribers actively rescue and engage with the mail.
- Do now: Finish the security audit, confirm authentication, and send only to the best engagement segment.
- Do next: Ask readers through owned channels to find the newsletter, move it out of spam, and engage naturally.
- Do later: Move DMARC policy in stages and return to the full list only after clean mailbox data.
