A CI email check should block promotion only when its result is tied to the exact test address, deployment, and pipeline attempt that produced it. Give each run a short-lived fixture, require a unique correlation token, and retain evidence of the outcome. Amazon SES’s mailbox simulator can test specific modeled responses; SES event publishing can show what happened after a send; inbox placement testing answers the separate question of where messages land.
What a promotion-ready email check must prove
A green job is weak evidence if nobody can identify which mailbox, deployment, and attempt it tested. A promotion gate is therefore both an assertion and an evidence contract: it must show that the expected message or event came from the intended run, and preserve enough context to explain the result later.
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Before making an AWS CI/CD job a promotion dependency, check that it can:
- Identify the test fixture and the pipeline run and attempt that own it.
- Match the received message to a correlation token expected by that attempt.
- Distinguish a successful send request from the downstream outcome the test actually requires.
- Record pass, failure, timeout, and cleanup outcomes in the job evidence.
Define the fixture contract
Create a fixture for one pipeline run and attempt, rather than relying on an undifferentiated reusable inbox. The following fields are an illustrative contract, not an AWS-prescribed standard:
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| Field | Purpose |
|---|---|
| Run and attempt ID | Separates retries and parallel executions so a message cannot be attributed to the wrong attempt. |
| Owner or component | Identifies the service or team responsible for the test. |
| Created and expiry timestamps | Show when the fixture was active and provide a basis for removing abandoned fixtures. |
| Target environment | Identifies the deployment environment under test. |
| Generated test address | Records the destination actually used by this attempt. |
| Correlation token | Lets the test reject messages that do not belong to the expected attempt. |
Have the application send to the generated address for that attempt. Put the expected correlation token in a message field the test can inspect, then reject messages that lack the token or carry a different one. Keep the token unique enough to distinguish concurrent runs and retries.
Define explicit outcomes for fixture creation, polling, assertion, and cleanup. Set a timeout and retry budget in the test contract; there is no universal polling interval established here. Cancellation can leave a fixture behind, so expiry and cleanup handling are prudent implementation choices, not SES requirements. Retain cleanup failures as evidence rather than allowing them to disappear behind an otherwise green job.
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Choose the test that matches the question
| Approach | What it establishes | Best fit | Key limitation |
|---|---|---|---|
| SES mailbox simulator | Application behavior for documented simulated success, bounce, complaint, and suppression-list scenarios. | Fast integration checks tied to a CI attempt. | It does not establish general inbox placement or recipient-provider behavior. |
| SES event publishing | Operational events reported through configured destinations, such as delivery, bounce, rejection, or delay. | Testing and retaining evidence for downstream event handling. | A successful send API response alone does not prove that the required downstream event arrived. |
| Inbox placement test | Placement across seed accounts at major mailbox providers, including inbox, spam, and missing results. | Campaign or release-readiness assessment. | Results are typically available in 2–4 hours, so it is not equivalent to a quick per-run fixture check; AWS does not state this as a guaranteed SLA. |
Use the SES mailbox simulator for modeled outcomes
For AWS-native integration tests, use the documented simulator scenarios rather than inventing invalid recipient addresses. The simulator covers delivery success, bounce, complaint, and suppression-list behavior. AWS says that simulator messages do not count toward the daily sending quota and do not affect deliverability or reputation metrics. They are still billed and remain subject to the account’s maximum sending rate. See AWS’s SES mailbox simulator guidance.
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The simulator proves how application logic handles modeled cases; it is not a test of ordinary recipients’ inbox placement. Also account for how results are represented: AWS documents that multiple simulated bounces from one request may be combined into a single response. If the gate depends on a bounce or complaint notification, assert that notification path as well as the initial send response.
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Retain downstream evidence with SES event publishing
A successful send API call confirms that SES accepted a request; it does not by itself prove delivery or that your event consumer handled the result. SES configuration sets let you select event types and destinations. Supported destinations include CloudWatch, Data Firehose, Pinpoint, SNS, and EventBridge. Published event types include sends, deliveries, opens, clicks, bounces, complaints, rejections, rendering failures, and delivery delays. See the SES event publishing documentation.
Where the application architecture permits, attach the pipeline run identifier as a message tag and retain the corresponding event data alongside the CI result. This is a practical traceability technique using SES’s tagging mechanism, not an AWS-prescribed CI design. The gate should assert the specific event it needs and correlate it to the run; merely enabling event publishing does not establish that the event was received or processed.
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Keep inbox placement separate from per-run integration checks
SES inbox placement testing sends a campaign to seed accounts across mailbox providers and reports aggregate and provider-level placement, including inbox, spam, and missing outcomes. AWS says results are typically available in 2–4 hours. That makes it useful for campaign or release readiness, but it answers a broader and slower question than whether one CI attempt handled a simulated response correctly. See AWS’s inbox placement test documentation.
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Troubleshoot setup without weakening the assertion
SES supports sending through the console, SMTP, or API. AWS describes the console as typically useful for test sends and monitoring sending activity, while bulk sending uses SMTP or the API. A domain identity covers its subdomains and email addresses; an email-address identity covers only that address. Check the relevant identity and sending setup when a test cannot send, but do not treat a successful manual console send as a substitute for a correlated CI result. See SES sending methods and SES identity scopes.
AWS’s May 18, 2023 Messaging Blog article on testing email sending and monitoring recommends testing both sending and event monitoring after pipeline changes. It also warns that testing with invalid addresses or accounts that yield no useful result can harm reputation. The mailbox simulator is the better fit for its documented simulated cases; it should not be used to make claims about general deliverability.
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