修正邮件接收时间和发件人展示

docs/project/integrations/superagent-agentbus-project-integration-guide.md

@@ -348,12 +348,14 @@ body.html
 body.text
 inline_images[]
 attachments[]
+received_at
 source.channel
 source.channel_account
 source.external_message_id
 source.external_conversation_id
 source.sender
 source.subject
+source.sent_at
 source.web_link
 reply_policy.mode
 reply_policy.final_only
@@ -366,6 +368,9 @@ reply_policy.final_only
 | `source.channel` | `channel`，例如 `EMAIL` |
 | `source.external_message_id` | `externalMessageId`，作为幂等键组成部分 |
 | `source.external_conversation_id` | `externalConversationId` |
+| `payload.received_at` 或 `source.received_at` | `receivedAt`，作为邮件来源接收时间 |
+| `source.sent_at` | `sourceSentAt`，作为邮件来源发送时间 |
+| `source.sender` | `senderSummary`，当前作为发件人展示值不打码 |
 | frame `id` | `agentbusFrameId` |
 | frame `session_id` | `agentbusSessionId` |
 | `payload` 规范 JSON | `payloadJson` 与 `payloadSha256` |