Sendmux is email inbox API for AI agents - multi-provider SMTP routing, dedicated agent mailboxes, and token-saving structured parsing in one API. The Sendmux blog covers AI agents, email deliverability, and the infrastructure powering agentic communication.
A developer checklist for choosing a mailbox-first cold email API for AI agents: persistent inboxes, scoped credentials, multi-provider routing, quota handling and usage-based billing.
Pair signed HMAC webhooks with Server-Sent Events for mailbox-first email event streaming: idempotency identifiers, CloudEvents envelopes, scoped credentials and delivery monitoring for agent mailboxes.
A developer checklist for email webhooks: payload fields that matter, HMAC-SHA256 signature verification with secret rotation, at-least-once deduplication, retries and replay, plus endpoint patterns that acknowledge fast.
A field guide to Agenticmail alternatives sorted by what each product is, agent inboxes, send-only pipes or connectors, with vetting checks, migration planning and pricing shape for fleets past 100 agents.
Four ways to integrate email from TypeScript, from typed unified SDKs and provider-specific clients to runtime adapters and mailbox-first APIs, with a developer checklist and code patterns that keep providers swappable.
How AI Inbx alternatives compare for developers, typed SDK ergonomics against mailbox-first persistence, with an evaluation checklist, migration risks and rate-limit realities.
A practical comparison of 11 SMTP relays covering deliverability signals, API versus SMTP integration depth, free-tier caps and pricing shape, with a decision checklist and trial steps for picking one.
How to wire email into LangChain agents, from the GmailToolkit starting point to mailbox-first APIs with per-agent inboxes, threading and scoped credentials.
Send email in Python with the standard library, from EmailMessage and smtplib through HTML alternatives and attachments, and know exactly when to move to a provider email API.
Email API pricing hides its real cost in the billing unit and the add-ons. This guide compares pay-as-you-go and tiered plans with worked maths at three volumes, plus the questions to ask before you commit.
