Guides · Tag
reliability
6 guides tagged reliability.
Developers · Sep 21, 2026
Accepted vs Delivered: What an Email Status Proves
Queued, accepted, delivered, bounced, unknown — what each email status actually proves, what it does not, and the correct next action for every one of them.
Developers · Sep 21, 2026
Agent Email API: Send, Receive and Reply in One Loop
Build the full two-way loop over REST: scoped keys, idempotent sends, the states a message moves through, inbound events, and replies that thread correctly.
Developers · Sep 21, 2026
Keep an Agent's Replies in the Right Email Thread
How Message-ID, In-Reply-To and References decide threading, why subject matching breaks, and how to keep an agent reply in the right conversation.
Developers · Sep 21, 2026
Handle Email Webhooks Without Processing Events Twice
Verify the signature against the raw body, deduplicate by event ID, enqueue durably, and keep a webhook retry from re-sending the email that produced it.
Developers · Sep 21, 2026
Test an Agent's Email Without Sending Real Mail
Use non-routable test inboxes to simulate inbound mail, exercise drafts, approvals and webhooks, and verify agent behavior before a live message goes out.
Developers · Sep 20, 2026
Idempotency Keys: Stop an Agent Sending Duplicate Emails
How send idempotency works: canonical payload hashing, the 30-day replay window, conflict versus expiry, and why retrying an unknown outcome is unsafe.