Support email for founders and their agents
Branded support addresses for every product you run, in one inbox. Claude, ChatGPT or your own code can read, draft and reply through MCP or a REST API, with guardrails so an agent can’t burn your domain.
Two ways in
MCP · OAuth · no keys
Paste https://tryinboxnest.com/mcp into Claude or ChatGPT, sign in to InboxNest and click Allow. Your assistant can then list, search and read conversations, save drafts, organize, and, only if you allow it, send replies from the right brand.
Using Claude Code? One command, no API key:
claude mcp add --transport http --scope user inboxnest https://tryinboxnest.com/mcp
Webhooks POST a signed event when a customer writes in, a reply is sent, or an email bounces. Your agent fetches the thread, drafts or replies, and InboxNest sends it from the right address.
Signed with HMAC-SHA256. Retried for more than a day if your endpoint is down.
POST https://your-agent.example/inboxnest
InboxNest-Signature: t=1762790400,v1=5f2b…
{
"id": "evt_3fJ2kq9XbW1nT7yLmP0aZc4d",
"type": "message.received",
"data": {
"conversation_id": "1234",
"domain": "leaseboss.ai",
"from": "sarah@example.com",
"subject": "Amendment not in my abstract",
"text_preview": "Hi, I uploaded the second amendment…",
"spam": false
}
}REST API · scoped keys
One API key with only the permissions you tick. List unread conversations and reply from the address the customer wrote to.
curl
# List unread conversations
curl "https://tryinboxnest.com/api/v1/conversations?unread=true&limit=5" \
-H "Authorization: Bearer $INBOXNEST_KEY"{
"data": [
{
"id": "1234",
"subject": "Amendment not in my abstract",
"unread": true,
"domain": {"id": "3", "name": "leaseboss.ai"},
"customer": {"email": "sarah@example.com", "name": "Sarah Chen"},
"customer_preview": "Hi, I uploaded the second amendment for our…"
}
],
"next_cursor": null
}# Reply from the right brand (needs mail:send and your OK)
curl -X POST https://tryinboxnest.com/api/v1/conversations/1234/reply \
-H "Authorization: Bearer $INBOXNEST_KEY" \
-H "Idempotency-Key: reply-1234-1" \
-H "Content-Type: application/json" \
-d '{"body_text": "Thanks Sarah, the Oak Street abstract now includes the second amendment."}'Node
const api = 'https://tryinboxnest.com/api/v1';
const headers = { Authorization: `Bearer ${process.env.INBOXNEST_KEY}` };
const { data } = await fetch(`${api}/conversations?unread=true&limit=5`, { headers })
.then((r) => r.json());
for (const c of data) {
await fetch(`${api}/conversations/${c.id}/reply`, {
method: 'POST',
headers: { ...headers, 'Content-Type': 'application/json', 'Idempotency-Key': `reply-${c.id}` },
body: JSON.stringify({ body_text: await writeReply(c) }),
});
}Python
import os, requests
api = "https://tryinboxnest.com/api/v1"
headers = {"Authorization": f"Bearer {os.environ['INBOXNEST_KEY']}"}
unread = requests.get(f"{api}/conversations", params={"unread": "true", "limit": 5}, headers=headers).json()
for c in unread["data"]:
requests.post(f"{api}/conversations/{c['id']}/reply",
json={"body_text": write_reply(c)},
headers={**headers, "Idempotency-Key": f"reply-{c['id']}"})Built for agents
Give each agent its own key with only the permissions it needs: read, draft, organize, reply, addresses or webhooks. Limit a key to some of your domains and set an expiry.
message.received, message.sent, bounces, complaints and more, signed so you can verify them and retried for more than a day if your endpoint is down.
Spin up billing@ or help@ on any connected domain with one call. Domains still need a person to add DNS records.
Agents save drafts that wait in your inbox with Send, Edit and Discard. Nothing reaches a customer until you say so.
Every message an agent sends is marked in the thread with the key that sent it, so you always know who said what.
After a quick review, send password resets and receipts from your own app through the same account. The official Resend SDKs work with InboxNest’s Resend-compatible endpoint.
Whether Claude connects through MCP or your script calls the REST API, one rule book applies: the same permissions, domain limits, sending switch and send limits. One API key works on both.
Guardrails
Protect your sending reputation. Every connected domain is authenticated with DKIM and a custom Return-Path, and every send from a person or an agent passes the same checks.
Drafts by default
New connections and keys start with read and draft. Sending is a permission you add on purpose.
Sending is off until you turn it on
Agents can only email customers after the account owner switches on “Allow AI apps to send replies”.
Per-key limits
Each key can send 30 replies an hour and 200 a day, on top of your account’s normal sending limits.
Approval and warm-up for new contacts
Starting conversations with new people, and app email, need a quick review first, then start with low daily limits that grow while bounces and complaints stay low.
Auto-pause on bounces and complaints
A key whose emails cause repeated hard bounces or a spam complaint is paused automatically, and you get an email.
Suppression lists
Addresses that bounced or marked mail as spam aren’t emailed again.
Every API action logged
Each request and tool call is listed in Settings for 90 days, next to the “Sent by API” labels in your inbox.
InboxNest is built for one-to-one customer conversations. Newsletters, purchased lists and cold outreach are not allowed.
POST /conversations/1234/reply
Checking before anything is sent…
Sent from support@leaseboss.ai
For the founder, too
Agents or not, InboxNest is where your support email lives: branded addresses for each product, one place to answer them, no Google Workspace required.
support@, hello@ or billing@ on every domain you run, as many as you need.
Every conversation in one place. Replies go out from the address the customer wrote to.
No migration. Forward just your support addresses, or point a domain’s MX records at InboxNest.
Add a contact form to any site, or share a hosted contact page. Questions land in your inbox.
Also included: threads that stay together, unread and follow-up flags, open tracking, and Sent, Spam and Trash.
Pay based on how many domains you manage. The API, webhooks and MCP are included on every plan. Card required. No charge until your trial ends.
By starting a trial, you agree to the Terms of Service and Privacy Policy.
Up to 2 domains
$9 / month
Up to 5 domains
$19 / month
Up to 10 domains
$29 / month
Need more than 10 domains? Contact us.