SentFromAI vs Resend
100 agent inboxes for $19/mo.
Give each AI agent its own email address, message history, and reply threads. SentFromAI Pro includes 100 inboxes, 20,000 emails a month, and 20 GB of storage. Start free with 5 inboxes.
Build around the agent’s inbox
Provision an inbox per agent
Create a dedicated address through the API when an agent needs one. Its inbox gives your application a place to retrieve messages and send replies, separate from another agent’s conversation history.
Keep context in native threads
Retrieve a conversation as a thread so your agent can read the earlier messages before replying. SentFromAI manages the email thread; your application decides what the agent may do.
Route work by inbox
Use the receiving inbox to route new messages to the right agent or customer workflow. Webhooks and WebSockets deliver events, while your application enforces access and reply permissions.
Pay for the resources your agents need
Choose SentFromAI for provisioned agent inboxes and native thread objects. Resend Pro offers more sending volume for $20/mo and includes receiving. If sending volume is your priority, that allowance matters.
| Plan tier | SentFromAI | Resend |
|---|---|---|
| Free tier | 5 inboxes · 5,000 emails | 3,000 emails (100/day) |
| Entry paid plan | Pro — $19/mo | Pro — $20/mo |
| Address model (entry plan) | 100 provisioned inboxes | Domain-based receiving |
| Inbound email | Included | Included on all plans |
| Monthly volume (entry) | 20,000 emails | 50,000 sent emails |
| Scale plan | Scale — $99/mo · 1,500 inboxes | Scale — $90/mo · 100,000 sent emails |
Checked September 25, 2026 against resend.com/pricing, resend.com/docs/dashboard/receiving/, and SentFromAI pricing. Resend lists 30-day data retention on its standard plans; Enterprise offers flexible retention. Verify current limits before purchasing.
How the email models compare
Both platforms send, receive, and support replies. The decision is how you want to organize agent addresses, messages, and conversation state.
| Capability | SentFromAI | Resend |
|---|---|---|
| Address model | Provisioned inbox per agent | Any address at a receiving domain |
| Send and receive email | ||
| Conversation handling | Native thread objects | Replies in the same thread |
| Retrieve received messages | ||
| Agent routing | Route by inbox | Route by recipient address |
| Real-time events | Hooks + WS | Webhooks |
| Custom domains (SPF/DKIM/DMARC) | ||
| SDKs & MCP server |
SentFromAI vs Resend — common questions
Can't I just use Resend's inbound parsing?+
Yes. Resend receives and stores email, supports content and attachment retrieval, and can reply in the same thread. SentFromAI instead organizes messages around provisioned agent inboxes and native thread objects. Choose based on the address model and workflow you need.
How do the developer tools compare?+
Both offer REST APIs, SDKs, and MCP access. Resend also documents receiving through its CLI. Test inbox provisioning, receiving, and reply handling against your own agent workflow rather than assume identical APIs.
Does SentFromAI do transactional sending too?+
Yes. SentFromAI supports sending as well as receiving, native threading, and provisioned per-agent inboxes. Resend also supports both sending and receiving.
How does pricing compare?+
SentFromAI Pro is $19/mo for 100 inboxes, 20,000 emails, and 20 GB of storage. Resend Pro is $20/mo for 50,000 sent emails, with inbound email included. The plans measure different resources.
Give each agent its own inbox
Start free with 5 inboxes and 5,000 emails. Upgrade to 100 inboxes for $19/mo when you're ready.