# What does resend.email.accepted prove?

> Prove that Resend accepted the email request. Version 1.0.0, certification Community. Every condition and timing rule of the signed Resend skill.

Canonical: https://provely.sh/verify/resend/resend.email.accepted  
Last reviewed: 2026-09-05  
Skill version: 0.1.0  
Certification: community  

**Prove that Resend accepted the email request. The accepted level proves that Resend holds an email record for the request. It does not prove that the message left the provider.**

*Contract identity.*

| Fact | Value |
| --- | --- |
| Contract id | `resend.email.accepted` |
| Version | `1.0.0` |
| Hash | `c8227388e474f64c` |
| Completion level | `accepted` |
| Certification | Community |
| Skill | [Resend 0.1.0](/verify/resend) |
| Valid for provider API versions | `1.5.1` |

## What is the intent?

Hand the email to Resend.

## What is the subject and the action?

| Member | Value |
| --- | --- |
| Subject type | `resend.email` |
| Subject identity | email_id = `$action.result.id` |
| Canonical effect | `message.send` |
| Provider operation | `POST /emails` |
| Idempotency | idempotency_key through `Idempotency-Key`, retry is safe |

## How does the evidence correlate with this operation?

| Strategy | Assurance | Keys | Required |
| --- | --- | --- | --- |
| `resource_id` | strong | email_id from `$action.result.id` | yes |
| `idempotency_key` | strong | idempotency_key from `$operation.id` | no |
| `fingerprint` | weak | to from `$input.to`; subject from `$input.subject` | no |

## Which evidence does the contract require?

Minimum evidence level `E2`. An independent channel is required. Minimum channels: 1.

| Channel | Level | Independence | Verifier | Description |
| --- | --- | --- | --- | --- |
| `email_readback` | E2 | provider readback | `http` | Read the email record. The http verifier returns the parsed Email object, so a condition path is $observed.email_readback.last_event. |
| `sent_events_by_intent` | E3 | provider event | `webhook` | The email.sent events for the same recipient and subject since the operation started. A count above one shows a second send. The webhook verifier returns {events, count, latest, earliest, types, duplicates_dropped}, so a condition reads the count. |

## Which conditions must all hold for VERIFIED?

| Condition | Meaning | Path | Operator | Expected | Evidence |
| --- | --- | --- | --- | --- | --- |
| `record_created_in_window` | The provider created the email record after the operation started. | `$observed.email_readback.created_at` | `time_after` | `$operation.created_at` | `email_readback` |
| `record_present` | The provider holds the email record with the returned id. | `$observed.email_readback.id` | `eq` | `$action.result.id` | `email_readback` |

## Which conditions give CONTRADICTED?

| Condition | Class | Reason | Path | Operator | Expected |
| --- | --- | --- | --- | --- | --- |
| `wrong_recipient` | wrong subject | The message went to a different recipient. | `$observed.email_readback.to` | `ne` | `$input.to` |
| `record_predates_operation` | pre existing state | The provider record is older than the operation. It proves nothing. | `$observed.email_readback.created_at` | `time_before` | `$operation.created_at` |
| `more_than_one_recipient` | partial completion | The record lists more than one recipient. This contract proves the outcome for one recipient. Use one operation per recipient. | `$observed.email_readback.to` | `array_length` | `{"min":2}` |
| `duplicate_email_present` | duplicate side effect | Resend sent more than one email for this recipient and subject since the operation started. Do not retry. | `$observed.sent_events_by_intent.count` | `gt` | `1` |

## Which observed states map to a verdict before completion?

| Rule | Match | Verdict | Reason |
| --- | --- | --- | --- |
| `terminal_failure` | `$observed.email_readback.last_event` in `["failed","suppressed"]` | FAILED | The provider reports that the message failed, bounced, or was suppressed. |
| `canceled` | `$observed.email_readback.last_event` eq `"canceled"` | CONTRADICTED | The schedule of the message was canceled. The provider will not send it. |

## How long does the runtime observe?

| Timing member | Value |
| --- | --- |
| Initial delay | 2000 ms |
| Poll interval | 10000 ms |
| Backoff | exponential factor 2, max 120000 ms |
| Maximum attempts | 60 |
| Timeout | 3600000 ms |
| Stale read window | 30000 ms |
| On timeout | UNVERIFIABLE (`evidence_unavailable_before_timeout`) |

## Where do these rules come from?

- `resend.openapi#/paths/~1emails/post`: [resend.openapi](https://raw.githubusercontent.com/resend/resend-openapi/main/resend.yaml), retrieved 2026-09-05
- `resend.openapi#/paths/~1emails/post/responses/200`: [resend.openapi](https://raw.githubusercontent.com/resend/resend-openapi/main/resend.yaml), retrieved 2026-09-05
- `resend.openapi#/paths/~1emails~1{email_id}/get`: [resend.openapi](https://raw.githubusercontent.com/resend/resend-openapi/main/resend.yaml), retrieved 2026-09-05
- `resend.openapi#/components/schemas/Email/properties/created_at`: [resend.openapi](https://raw.githubusercontent.com/resend/resend-openapi/main/resend.yaml), retrieved 2026-09-05
- `resend.openapi#/components/schemas/Email/properties/id`: [resend.openapi](https://raw.githubusercontent.com/resend/resend-openapi/main/resend.yaml), retrieved 2026-09-05
- `resend.openapi#/paths/~1emails~1{email_id}/get/responses/200`: [resend.openapi](https://raw.githubusercontent.com/resend/resend-openapi/main/resend.yaml), retrieved 2026-09-05

### Can resend.email.accepted return VERIFIED from the action response alone?

No. The minimum evidence level is E2. The action response is E1. The completion conditions read `email_readback`.

### What happens after the timeout?

The verdict is UNVERIFIABLE with the reason `evidence_unavailable_before_timeout`. The operation ends.

## Read next

- [Read the Resend verification page](https://provely.sh/verify/resend)
- [Read the resend.email.bounced contract](https://provely.sh/verify/resend/resend.email.bounced)
- [Read the resend.email.delivered contract](https://provely.sh/verify/resend/resend.email.delivered)
- [Read the resend.email.sent contract](https://provely.sh/verify/resend/resend.email.sent)
- [Read what a completion contract contains](https://provely.sh/contracts)
- [Read what a receipt proves](https://provely.sh/receipts)