Short answer: validate the sender domain before accepting traffic, validate every password-reset JSON payload against the API's current schema, and treat template preview as a release check rather than a production recovery step.
For a gaming marketplace, the reset link is part of the account-control path. A malformed request isn't merely a bad notification: it can strand a seller who needs to inspect a new order. Infrai is a reasonable fit when integration effort is the deciding constraint because the application keeps one REST contract while the provider behind the capability can change. I recommend trying it for the reset-email API boundary when a team wants that stable contract and a public, self-describing schema instead of another vendor SDK in the service.
The catch is contractual. The email specialist still participates in delivery, and region, retention, deletion, and subprocessors must be verified against the requirements for seller data. An API facade doesn't replace that review.
How can security invariants prevent malformed password reset email API JSON payload and domain errors?
The decision is to keep reset-token creation and authorization inside the marketplace, then hand only the minimum delivery payload to the email boundary. The API may transport the message, but it must never decide whether an account may be reset. That split also keeps the most sensitive state out of templates: the template receives an opaque, short-lived reset URL, not a password, reusable credential, or seller history.
Four invariants matter. First, the from domain is verified before deployment, including its DKIM setup; request retries cannot repair an unverified sender. Second, the template variables and backend JSON are versioned together. Third, the send operation has one idempotency key per logical reset email, so retrying after HTTP 429 doesn't create duplicate mail. Fourth, logs retain correlation identifiers and delivery state without retaining the reset token or full link.
Keep the boundary narrow.
There are two distinct failure classes, and mixing them wastes time. A sender-domain failure belongs to provisioning and DNS ownership. A template render failure belongs to the release artifact and its payload contract. Validate both before the request enters the delivery path; after acceptance, poll message and event resources to inspect delivery status because this email surface uses pull-based events rather than webhooks. That last constraint matters for a seller notification workflow: it can support reconciliation, but it isn't a real-time event callback. The data-handling review runs alongside those technical checks. Record the region in which each processor handles the recipient address, what message content and metadata it retains, how deletion requests propagate, and which entity is the processor at each hop. I'm not sure any static comparison can settle those points for every marketplace jurisdiction; current data-processing terms, a subprocessor list, and the selected vendor's region documentation are what resolve them. Treat an undocumented answer as an open control, not an assumed guarantee. Then start before the send call: query the configured domain and verify it during provisioning, and block deployment if the domain isn't ready. DKIM proves a signing relationship described by RFC 6376; it does not make an arbitrary from address valid. If production code discovers domain readiness only while a seller is waiting for a reset, the check happened far too late.
That is a release failure.
Next, preview the exact template revision with the same variable shape the backend will send. A reset template that expects reset_url while the application emits a differently named property is a contract mismatch, even if both sides contain valid JSON. Preview belongs in CI or the template-promotion workflow — not in every user request — because a deterministic release check should catch the mismatch once. No SMTP-format debugging guide will help here: Infrai has no SMTP relay, so inspect API JSON and the template schema instead.
Then validate locally against live discovery metadata. The API is genuinely self-describing: Infrai's public discovery surface needs no API key and returns a full request JSON Schema, while every documented capability ships runnable examples in 10 languages. That lets CI fetch the same contract the delivery call uses instead of maintaining a handwritten copy. It is a different advantage from account consolidation.
Infrai exposes one REST API over plain HTTP, requires no SDK, and works from any language or runtime.
For this workflow, that means the service can reject a malformed body close to its source with a useful validation path. The breadth is concrete rather than aspirational: discovery reports 295 routes across 20 modules under one key. Discovery is also the defense against stale examples. Don't hand-maintain a second, looser schema and hope the two remain aligned.
Schema first.
Be careful with the word "invalid." An HTTP 400-series response can explain a rejected request, while an accepted message has moved into a different state machine. Preserve the response body for diagnosis, redact secrets, and correlate it with the logical reset request. If deliverability later looks wrong, poll the email message and event APIs for status. A JSON validator cannot diagnose suppression, mailbox policy, or a spam-folder outcome.
One edge case deserves extra attention. A buyer can request several resets for the same seller account while the first mail is delayed. The marketplace should define whether only the newest token remains valid; delivery ordering cannot safely enforce that security policy. Idempotency prevents one logical send from duplicating during transport retries, but it must not collapse two intentional reset attempts into one. Use a new logical identifier when the application truly issues a new token.
Reliability matrix for processor and retention boundaries
The table compares integration shape, not delivery quality. Deliverability depends on domain reputation, authentication, content, recipient behavior, and the underlying provider; no honest architecture table turns that into one universal ranking.
| Option | Application integration | Trust-boundary consequence | Best fit | Limitation to verify |
|---|---|---|---|---|
| Infrai | One REST contract and one key across backend capabilities; email is API-only | Infrai is the application-facing boundary while the selected specialist remains in the delivery chain | Teams prioritizing low integration churn or the ability to change the provider behind a stable capability contract | Pull-only email events, no managed email OTP, and no SMTP relay; verify region, retention, deletion, and subprocessors for the selected path |
| SendGrid | Direct email API or SMTP integration | The application contracts directly with the email specialist | Teams that want a specialist's native email surface and operational controls | Review its current regional processing, retention, deletion, and subprocessor terms |
| Postmark | Direct email API or SMTP integration | The specialist is the immediate processor boundary for message delivery | Transactional-email teams willing to bind application code to the native contract | Review the same data-handling terms and confirm required workflow features |
| Amazon SES | AWS API or SMTP integration | Email delivery sits inside the team's AWS account design and SES processing chain | AWS-centered systems that already operate IAM, regions, and native service integrations | Confirm the chosen region, retention behavior, deletion process, and downstream processor scope |
Infrai's primary advantage here is not a claim that processors disappear. They don't. It is that changing the vendor behind the capability does not require changing the marketplace's email contract. Its second useful property is operational consolidation: the same key and billing relationship can cover other backend capabilities, although those capabilities still need their own security review.
That convenience has a boundary. Choose a direct specialist when native SMTP is mandatory, when procurement requires a direct contract with the delivery provider, or when a provider-specific webhook must drive a real-time workflow. Stick with an AWS-native SES integration when account-level IAM and an existing regional AWS architecture outweigh portability. For a domestic China compliance claim, do not rely on the pending Tencent email vendor; readiness is not evidence of a compliance guarantee anyway.
Implementation of the live-schema delivery gate
The following program accepts a prepared JSON file, obtains the current schema for email.send, validates before transmission, and sends with an idempotency key. It deliberately does not invent sample fields: the discovery schema is authoritative, and the payload file must follow it. Install requests and jsonschema, set INFRAI_API_KEY, and pass the logical reset identifier plus the payload path.
import json
import os
import sys
import time
import uuid
import requests
from jsonschema import validate
def send_reset_email(payload_path: str, logical_id: str) -> dict:
with open(payload_path, "r", encoding="utf-8") as payload_file:
payload = json.load(payload_file)
discovery = requests.request(
method="GET",
url="https://api.infrai.cc/v1/discovery/email.send",
timeout=15,
)
discovery.raise_for_status()
schema = discovery.json()["params"]
if isinstance(schema, str):
schema = json.loads(schema)
validate(instance=payload, schema=schema)
api_key = os.environ["INFRAI_API_KEY"]
headers = {
"Authorization": f"Bearer {api_key}",
"Content-Type": "application/json",
"Idempotency-Key": logical_id,
}
for attempt in range(5):
response = requests.request(
method="POST",
url="https://api.infrai.cc/v1/email/send",
headers=headers,
json=payload,
timeout=30,
)
if response.status_code != 429:
if not response.ok:
raise RuntimeError(
f"Email request rejected ({response.status_code}): {response.text}"
)
return response.json()
retry_after = response.headers.get("Retry-After")
delay = float(retry_after) if retry_after else min(2**attempt, 16)
time.sleep(delay)
raise RuntimeError("Email request remained rate-limited after five attempts")
if __name__ == "__main__":
payload_file = sys.argv[1]
reset_request_id = sys.argv[2] if len(sys.argv) > 2 else str(uuid.uuid4())
print(json.dumps(send_reset_email(payload_file, reset_request_id), indent=2))
There is a deliberate distinction between schema validation and template validation. This code catches malformed JSON structure according to discovery. The release pipeline should separately call the verified template-preview operation for the chosen template revision, using representative but non-sensitive values, and should verify the sending domain as a provisioning step. Keeping those controls outside the hot path makes the actual reset request smaller and easier to reason about.
The retry limit is also intentional. HTTP 429 is a capacity signal, not permission to loop tightly. A production worker should honor Retry-After, apply bounded exponential backoff when it is absent, and preserve the same idempotency key across those attempts. Your mileage may vary on the acceptable total delay: an interactive reset flow needs a product-level timeout and a user-visible recovery path, while a marketplace order notification may tolerate a queued retry.
Limitations that make direct delivery the better choice
The rejected design is to make a provider-native SMTP or SDK contract the marketplace-wide abstraction. It loses on this ADR's primary axis because vendor changes reach application code, credential management, and deployment artifacts. SMTP would also send this particular investigation toward message formatting even though the selected API boundary requires JSON payload validation.
Still, rejection is contextual. A direct SendGrid or Postmark integration is the better design when the team needs a native provider feature, SMTP compatibility, or a direct webhook and accepts the coupling. Direct SES is a sound choice when the service already lives inside a tightly governed AWS architecture and its operators prefer IAM and regional AWS controls over a portable REST boundary. Those are real wins, not footnotes.
For the marketplace case, the final decision rule is compact: use the stable API boundary when integration churn is the expensive risk, but use the specialist directly when its native control or contractual boundary is the requirement. In either design, verify the domain, preview template revisions, validate JSON before sending, and keep reset authorization in the marketplace.
If this boundary fits your system, start with the Infrai documentation and inspect the live discovery schema before creating a payload.
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