Service explained in plain language
Amazon SES is an email-sending service. An application can connect to SMTP successfully yet still fail to send a message, and an accepted message is not proof that a person saw it in an inbox. Diagnose the exact stage: network connection, encrypted login, sender authorization or later delivery.
Setup prerequisites and starting sequence
- Select the intended SES region, verified sending identity and supported SMTP endpoint. Review account sending restrictions before planning production traffic.
- Create and protect appropriate SMTP credentials; do not assume an ordinary AWS API access key is the same credential. Configure the required encrypted connection and approved sender.
- Test with controlled recipient addresses and configure delivery/bounce evidence, bounded retries and operational ownership. Keep transactional and marketing responsibilities explicit.
Start in non-production with the approved account/subscription, region and owner. Follow the linked service instructions for exact console/API options; provisioned resources may incur charges.
Example operational issue
Deployment notices stop after a server move. The application is configured with a valid-looking AWS credential but SMTP rejects authentication. Repeated message retries do not correct the credential type or endpoint mismatch and can obscure the initial useful error.
This is an illustrative operational example. Capture the exact error and time before making changes.
Troubleshooting: evidence before changes
| Observation | First check | Why it matters |
|---|---|---|
| Connection times out | Check destination hostname, selected port and authorized outbound path | An unreachable SMTP endpoint must be separated from a login failure. |
| Authentication is rejected | Confirm the credential type, configured region and application secret reference | Correct API access elsewhere does not demonstrate correct SMTP authentication. |
| Login works but sending is rejected | Read the SMTP response and check sender verification and account restrictions | Transport access does not override sending-policy requirements. |
Begin with status and scoped diagnostics. Sanitize shared evidence and escalate any check beyond your approved access.
Corrective action and change boundary
Correct the documented authentication or sender condition while preserving TLS verification. Update the application's protected configuration and restart only the component required to reload it. Review duplicate-send risk before replaying queued notices. Do not paste credentials into a test transcript or disable encrypted transport to make a connection appear successful.
Verification: what proves recovery
Send one controlled notification, retain its message identifier and inspect relevant delivery evidence. Confirm the recipient can locate it and distinguish provider acceptance from inbox placement. Exercise a safe failure case so rejected messages remain visible to operations rather than disappearing after an exception.
Monitoring, SLI, SLO and SLA
Track notification acceptance, permanent rejection, bounce evidence and oldest queued notice age separately. A useful internal SLO is that an agreed proportion of deployment notices reach the sending-provider acceptance boundary within a defined interval; inbox arrival requires additional evidence and scope.
SLI means the measured result; SLO means an agreed internal target. SLA means a contractual commitment with its own scope and remedy. The training targets here are examples, not vendor commitments; verify current service terms before promising an SLA.
A sample target is 99% of valid queued operational notices accepted by the sending provider within two minutes; record recipient delivery separately.
SOP and escalation handover
The mail owner approves sender and SMTP changes; the application owner controls retry semantics. Keep the sanitized SMTP response, region, sender identity and message identifier. Escalate uncertain deliveries before bulk replaying an entire historical notification queue.
SOP means standard operating procedure. Retain owner, evidence, approved change, reversal conditions and acceptance. Escalate with sanitized errors and resource identifiers.
Beginner glossary
SMTP: a mail-submission protocol. Bounce: a delivery failure report. Verified identity: an approved sender domain or address in the relevant service configuration.
Clouvenix can help scope setup, management and operational support around a documented environment and agreed acceptance criteria.
Technical reference
Official AWS service guidance. Validate resource-specific prerequisites and supported behavior against the deployed version. This walkthrough defines an investigation and operating contract; it does not authorize changes to someone else's environment.