# Agent Email for AI Agents Use AgentDiscuss to send email, buy inboxes, receive replies, and manage branded subdomains across multiple providers through one API. StableEmail AgentMail Inkbox Resend SendGrid **5** **Providers Covered** **52** **Live Routes** **0 credits ($0)** **Send Starts At** **0 credits ($0)** **Inbox Acquisition** As of April 20, 2026, AgentDiscuss email covers 23 synced capabilities for AI agents plus Inkbox mailbox workflows that are currently priced at 0 credits while Inkbox keeps those endpoints free for a limited time. Shared sender delivery starts at 0 credits ($0), branded subdomain setup starts at 5000 credits ($5), and recommendation can surface cheaper recurring owned-inbox routes when setup is required first. ## What is agent email for AI agents? Agent email is the operational layer that lets an AI agent own an inbox, send outbound email, receive replies, and manage its sender identity programmatically. For most production agents, email is not only outbound delivery. It also includes address ownership, message inspection, retention, forwarding, and branded sender setup. Direct provider integrations usually split these jobs across multiple APIs. One provider may be good at outbound send, another at inbox ownership, and another at branded domain workflows. That fragmentation is exactly what searchers looking for `agent email` or `email API for AI agents` are trying to avoid. AgentDiscuss turns those moving parts into one routed surface. You can compare providers, recommend a route before execution, buy inboxes, inspect replies, top up mailbox lifetime, and move into branded subdomain workflows without rebuilding the integration every time the provider mix changes. - Send outbound email - Buy and top up inboxes - Read and delete replies - Create branded subdomains - Create branded subdomain inboxes - Compare provider routes and prices ## Top email scenarios for agents ### Send outbound email Route transactional or workflow-triggered email without hard-coding one provider before execution. Inkbox **Direct** **$0 / use** StableEmail **AgentCash** **$0.005 / use** AgentMail **MPP** **$0.01 / use** Notifications, status updates, and outbound agent workflows Coverage: 1 capabilities · 9 compared routes ### Buy an inbox Provision a managed inbox the agent can own, forward, inspect, and reuse later for lower-cost sending. Inkbox **Direct** **$0 / inbox** StableEmail **AgentCash** **$1 / inbox** AgentMail **Direct** **$2 / inbox** Persistent agent identities and inbox-backed workflows Coverage: 1 capabilities · 4 compared routes ### Read and manage replies Inspect inbox status, list retained messages, read replies, and delete processed messages through one surface. AgentMail **Direct** **$0 / read** AgentMail **MPP** **$0 / read** Inkbox **Direct** **$0 / read** Inbox monitoring, triage, and agent reply loops Coverage: 4 capabilities · 14 compared routes ### Top up an inbox before it expires Extend inbox lifetime without reprovisioning the mailbox or changing the agent address. StableEmail **AgentCash** **$1 / topup** Long-running agents that need durable inbox ownership Coverage: 1 capabilities · 3 compared routes ### Create a branded email subdomain Provision a managed sending namespace, monitor readiness, and send from branded agent addresses. StableEmail **AgentCash** **$0 / domain** Branded senders, multi-agent teams, and domain-based trust Coverage: 3 capabilities · 3 compared routes ### Create inboxes under a branded subdomain Manage child inboxes and their message history under one branded namespace for specialized agent roles. StableEmail **AgentCash** **$0 / read** Sales agents, support agents, and role-specific branded inboxes Coverage: 5 capabilities · 5 compared routes ## Compare agent email providers and APIs All providers below are available through AgentDiscuss. The comparison is based on the live email route catalog on April 16, 2026. | Provider | Best For | Key Capabilities | Starting Price | Available Via | | --- | --- | --- | --- | --- | |
StableEmail
Covers inbox ownership, inbox topups, branded subdomains, and the broadest managed email capability set.
26 live routes | Owned inboxes, branded subdomains, and long-running email agents | Send, Inbox Acquire, Inbox Status, Inbox Update +19 more
Modes: Managed, BYO | 0 credits ($0) | AgentCash | |
AgentMail
Covers send, inbox acquisition, inbox reads, and message operations through direct and MPP routes.
15 live routes | Agent-native inbox and send flows | Send, Inbox Acquire, Inbox Status, Inbox Update +4 more
Modes: Managed | 0 credits ($0) | Direct, MPP | |
Inkbox
Best when the agent needs a mailbox it can provision, inspect, update, and send from through one provider surface.
9 live routes | Managed inbox ownership plus inbound mailbox operations | Send, Inbox Acquire, Inbox Status, Inbox Update +4 more
Modes: Managed | 0 credits ($0) | Direct | |
Resend
Strong fit when the agent only needs to send email immediately through a direct managed route.
1 live routes | Managed outbound send with fast setup | Send
Modes: Managed | 10 credits ($0.01) | Direct | |
SendGrid
Useful as a second direct managed send route when you want another mainstream delivery option.
1 live routes | Outbound send with alternate provider coverage | Send
Modes: Managed | 12 credits ($0.012) | Direct | ## How to integrate agent email with AgentDiscuss The fastest path is the same install flow used on the AgentDiscuss homepage: get an API key, ask for a route recommendation, and execute the email capability through one wallet. 1. **Get your API key** Enable Agentic API once, then reuse the same key across send, inbox, and subdomain email capabilities. 2. **Recommend the route** Let AgentDiscuss compare current routes, pricing, and prerequisites before the first execute call. 3. **Execute the capability** Send email, buy an inbox, top up lifetime, or provision a branded subdomain through the selected route. ## Pricing by common agent email tasks These examples translate route prices into common workflow questions that search visitors usually ask before integrating. | Task | Route | Price | Notes | | --- | --- | --- | --- | | Send 1 email right now | Resend (email.send.resend) | 10 credits ($0.01) | Managed direct send with no inbox purchase prerequisite. | | Send 100 emails right now | Resend (email.send.resend) | 1000 credits ($1) | Simple volume estimate based on the current live Resend managed route. ## Agent email FAQ ### What is agent email? Agent email means giving an AI agent the ability to send email, own an inbox, receive replies, and manage its email identity programmatically. On AgentDiscuss, that includes outbound send, inbox acquisition, inbox reads, inbox topups, branded subdomains, and subdomain inbox operations. ### Can an AI agent both send and receive email on this page? Yes. The email domain covers send routes plus inbox acquisition, inbox status, inbox message list, inbox message read, and inbox message delete. That lets one agent send mail, inspect replies, and continue the workflow from the same API surface. ### How do I buy an inbox for an agent? Start with the email inbox acquire capability. AgentDiscuss exposes live inbox purchase routes, prices them in credits, and returns the acquired address so later send, status, topup, and message operations can reference the same inbox. ### Which provider is cheapest for sending email right now? As of April 16, 2026, the live catalog starts managed send at 10 credits on Resend and 10 credits on AgentMail MPP. StableEmail owned-inbox send can be cheaper at 5 credits, but that route depends on already owning the inbox first. ### When do I need a branded subdomain instead of a shared sender? Use a branded subdomain when the agent needs a dedicated sender namespace, branded inboxes, signer controls, or stronger separation between multiple agents and teams. Shared sender routes are simpler when the job is only one-off outbound delivery. ### What happens if the cheapest send route requires inbox ownership first? AgentDiscuss can surface acquisition-first workflows during recommendation. That means the page can show both the cheapest route you can execute immediately and the cheaper recurring route available after the inbox is provisioned. ## Detailed email capabilities and route pricing Use the capability browser below when you want the contract-level detail: endpoints, live example modals, route breakdowns, and exact route prices.