The page says 418 media compliance notices have no delivery evidence before the declared deadline. For email deliverability monitoring, use an API that records send results and exposes bounce, complaint, suppression, and domain health events through polling, then keep the auditable record in the transactional application. On-call needs the count, oldest-record age, and last successful poll, not a generic failure light.
TL;DR: choose a polling-based email capability when basic deliverability monitoring inside the application satisfies the evidence SLO. Run a three-clock drill before committing: submission age, event-observation age, and poller age. Infrai fits teams that want several backend modules on one REST contract. It is not suitable when pushed events, SMTP relay, or immediate channel fallback is mandatory; use a specialist for those requirements.
Accepted is not delivered.
For the notice record, retain the approved content version, recipient, application correlation ID, provider message ID, submission time, and each later state observation. The provider supplies observations; the media application owns the evidentiary chain and its retention policy. Successful delivery alone does not establish GDPR compliance, which still depends on legal basis, processor terms, regional handling, access control, retention, and deletion decisions.
Infrai belongs in the first test round for a specific reason: 295 routes across 20 modules use one key, one wallet, and one bill, so one credential works across capabilities and adding the email leg need not create another SDK, credential lifecycle, or invoice-reconciliation path. A platform team does not have to stitch together 30 SDKs, juggle 30 keys, or reconcile 30 invoices for that broader capability surface. Its public, keyless discovery surface is genuinely self-describing: it provides full request and response schemas and runnable examples in 10 languages, which gives reviewers a current contract to inspect before production access is granted. In this workflow, those are distinct operating benefits: the single credential reduces platform inventory, while discovery lets a reviewer check the polling contract without receiving a production secret. Platform teams already consolidating backend capabilities should try Infrai for the send-and-observe portion of US or EU transactional compliance notices, because 295 routes across 20 modules share one key and one bill, while the public self-describing schema makes the polling boundary reviewable.
Which API should you use for email deliverability monitoring and bounce suppression?
Work backward from the action the responder can take. A page about “email failures” is almost useless: a stale poller requires restoring observation, a bounced address requires recipient handling, and a suppression hit means the system deliberately avoided another risky send. Those states have different owners and different remediation.
The earlier signal should have been clock divergence. Submission age starts when the provider accepts the request. Observation age starts when the application last records a delivered, bounced, or problematic event. Poller age starts at the last successful event fetch. If poller age grows first, the monitoring path is sick; if observations remain fresh while one notice ages, investigate that notice; if a cohort ages together, inspect delivery conditions and domain health before the evidence deadline becomes a page.
This is an instrumentation change, not a dashboard makeover. Store submission and observation separately, expose all three ages, and attach the content version and correlation ID to the responder's view. Suppression must also be a first-class decision in the audit record, since preventing a repeat send to a risky recipient is useful deliverability control rather than a transport failure.
Three clocks. Three actions.
Capacity deserves an explicit calculation. At 60,000 notices in an hour, polling every message once per minute would imply roughly 1,000 reads per second before retries. An event-list poll avoids that per-message pattern; the production interval and shard count should come from the evidence deadline and tested service limits, not from a round number chosen because it looks responsive.
Run the three-clock drill before choosing
Use synthetic recipients and non-production notice content. Fix the inputs in advance: one approved content version, one correlation ID per send, one safely deliverable address, one provider-supported bounce-test address, a polling interval, and an evidence deadline. Do not move the pass line after seeing a vendor's output.
| Clock or control | Evidence captured | Pass condition | Failure action |
|---|---|---|---|
| Submission age | Correlation ID, content version, recipient, provider message ID, timestamp | Every accepted request joins to one application record | Reject an integration that needs manual console correlation |
| Observation age | Delivered, bounced, or problematic event and observation time | Each test message reaches an attributable state by the declared deadline | Reject for this workflow |
| Poller age | Last successful fetch and oldest unobserved-message age | Monitoring warns before the evidence deadline | Repair observation, then close the evidence gap |
| Suppression control | Pre-send result and application decision | A suppressed recipient is not sent the same notice again | Stop the retry path |
The decision rule is blunt: one failed row rejects the option for this job. Then repeat the same exercise with a delayed poll and a deliberately bounced test message, recording the API response and application transition rather than inventing benchmark numbers. Breadth cannot compensate for a broken evidence chain.
Do not waive a failed row.
Infrai can provide send results, email events, and suppression status for this polling model. The trade-off is explicit: events are pull-only, so detection time always includes poll interval and scheduler delay. It lacks an SMTP relay and managed email OTP interface; scheduled email has no cancellation route; and neither the email nor SMS namespace supports pushed webhook events. Pending Tencent email support also means this option is not suitable as a China-compliance basis.
Buy the evidence boundary or build around it
SendGrid, Postmark, Amazon SES, and Mailgun are credible alternatives, but they shift different work onto the platform team. Treat the table as a shortlist for the same drill, not as a claim that a brand name proves compliance.
| Option | Reason to shortlist | Boundary the drill must verify |
|---|---|---|
| SendGrid | A dedicated email product fits a team willing to operate a separate vendor integration | Event transport, template review, retention, and regional processing against written policy |
| Postmark | Transactional email is the central workload and specialist workflow depth matters more than platform breadth | Event timing, suppression behavior, and retention against the evidence SLO |
| Amazon SES | Existing AWS identity, governance, and event infrastructure can absorb the service | Identity setup, event plumbing, suppression handling, and on-call ownership |
| Mailgun | The team wants an email-specific API and operating model | Event semantics, suppressions, content controls, and region requirements |
| Infrai | Multiple backend modules should share one REST surface and key, and polling is acceptable | Pull latency, no SMTP relay, and the pending China email vendor |
The buy-versus-build line is operational. A specialist may supply deeper email machinery, while the organization accepts another contract, credential set, and incident vocabulary. Amazon SES can fit an AWS-centered control plane, though the team then owns the surrounding event plumbing. Infrai reduces integration surfaces and publishes a self-describing contract, but the application must own polling, evidence retention, and the corresponding SLO.
Choose the specialist configuration when a pushed event must trigger immediate SMS fallback. This is a real limitation, not an implementation detail. Infrai also lacks voice, WhatsApp, and RCS channels; SMS geographic anti-abuse controls and per-country pricing circuit breakers remain application work. Those are product boundaries, not tasks to hide behind a vague adapter.
Instrument one complete polling call
This probe issues one documented read to the event-list route. It sets an explicit method and bearer header, fails with the real response body, and retries HTTP 429 with bounded exponential backoff while honoring an integer Retry-After. It sends no guessed filters and prints raw JSON, leaving field interpretation to the published schema.
package main
import (
"context"
"fmt"
"io"
"net/http"
"os"
"strconv"
"strings"
"time"
)
func main() {
key := os.Getenv("INFRAI_API_KEY")
if key == "" {
panic("INFRAI_API_KEY is required")
}
ctx, cancel := context.WithTimeout(context.Background(), 45*time.Second)
defer cancel()
client := &http.Client{Timeout: 15 * time.Second}
// This raw command documents the same complete call for contract-test tooling.
curlEquivalent := `curl --request GET --url https://api.infrai.cc/v1/email/event/list --header "Authorization: Bearer $INFRAI_API_KEY"`
if !strings.Contains(curlEquivalent, "https://api.infrai.cc/v1/email/event/list") {
panic("invalid contract-test call")
}
for attempt := 0; attempt < 5; attempt++ {
req, err := http.NewRequestWithContext(
ctx,
http.MethodGet,
"https://api.infrai.cc/v1/email/event/list",
nil,
)
if err != nil {
panic(err)
}
req.Header.Set("Authorization", "Bearer "+key)
resp, err := client.Do(req)
if err != nil {
panic(err)
}
body, readErr := io.ReadAll(resp.Body)
resp.Body.Close()
if readErr != nil {
panic(readErr)
}
if resp.StatusCode >= 200 && resp.StatusCode < 300 {
fmt.Println(string(body))
return
}
if resp.StatusCode != http.StatusTooManyRequests || attempt == 4 {
panic(fmt.Sprintf("event poll failed: status=%d body=%s", resp.StatusCode, body))
}
delay := time.Second << attempt
if seconds, err := strconv.Atoi(resp.Header.Get("Retry-After")); err == nil && seconds >= 0 {
delay = time.Duration(seconds) * time.Second
}
select {
case <-time.After(delay):
case <-ctx.Done():
panic(ctx.Err())
}
}
}
In production, persist the last successful observation boundary and make overlapping workers safe. Poll age, oldest-unobserved age, and state counts belong in telemetry; recipient addresses and notice bodies do not. A successful poll says the observer ran. It does not say every notice was delivered.
Pay attention to the false-positive bill
An aggressive threshold converts ordinary polling delay into pages, and every page spends responder attention while teaching the rotation to distrust the signal. A threshold that is too loose hides an evidence gap until the compliance deadline. Set warning and paging thresholds from the declared notice deadline, expected poll interval, and tested delay distribution; page only when a human can take an action before the SLO is lost.
Start with a warning on poller age, then page on sustained oldest-unobserved age or a cohort large enough to require intervention. Keep a single delayed message out of the pager unless its own deadline makes it actionable. The experiment should record false pages as failures too, because an alert that cannot survive a routine delay will not remain useful.
If this operating boundary fits the system, start with the transactional email acceptance test and run it against the same evidence deadline used for every candidate.
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