# Sending Inboxes Revnu Buys and Warms Up

> Why Revnu sets up dedicated sending domains and inboxes for cold email, who pays for them, what you approve, how long they take to warm up, how many emails they send and how to check their progress.

Canonical: https://revnu.com/docs/sending-inboxes
Last updated: 2026-11-07

Revnu runs its own sending infrastructure for cold email: dedicated sending domains carrying your brand, fully authenticated and warmed before they send, sized to your plan. Cold email goes out from those inboxes instead of your real domain, so your everyday email is never at risk.

Revnu pays for them, nothing is bought until you approve, and they're ready to send in days to weeks. If you want to send today, connect your own Gmail or Outlook as well ([connect Gmail or Outlook](https://revnu.com/docs/connect-email.md)). For spam and blacklists in general, see [will Revnu's emails land in spam?](https://revnu.com/docs/deliverability.md).

## What do I approve?

Buying domains and inboxes spends money, so it always waits for you, whatever your [approval settings](https://revnu.com/docs/approvals.md) say.

### 1. Open the proposal in Review

Revnu proposes the setup in **Review**: the domains, the inbox addresses and the person each inbox sends as.

### 2. Check the names

Every inbox sends as a real person on your team, with their first and last name. If Revnu doesn't know who should send, it asks you first.

### 3. Approve or reject it

Approve it, or reject it if you'd rather not use separate domains. Rejecting is fine: your first emails can go from your own inbox instead.

### 4. Wait for Revnu's message

The inboxes warm up in the background. Once they pass their warm-up and delivery checks, Revnu messages you and names the inboxes that are ready for outreach. You don't need to keep checking.

## Why does Revnu want to buy domains that look like mine?

Cold email goes to people who didn't ask for it. Some of them will ignore it or mark it as spam, and that counts against the domain it came from. A dedicated sending domain keeps that away from the address you use for customers, investors and your team. Anyone who visits a sending domain is sent on to your real website.

Revnu watches every mailbox and pauses a mailbox automatically when bounces or refusals climb.

## Who pays for them?

Revnu does, within a monthly limit set by your plan. Managed's limit is higher than Pro's. If you ask for more than your plan allows, Revnu tells you up front, before anything is bought: what's in use against your limit, and how many emails a day your current inboxes will send once they're warmed up. That's usually plenty.

## How long until they can send?

Plan on days to weeks. After you approve, the inboxes are authenticated and warmed in the background, and start outreach once those checks pass. Revnu keeps working meanwhile: it builds your lead list and gets your sequence ready, so emails can start as soon as the inboxes are ready.

Want a sense of timing before Revnu's message? Ask "when will these inboxes start sending?". Revnu reads the setup's progress and tells you where it stands. Treat any date it gives as an estimate.

> **Note:** During a one-day free trial, Revnu sends from your own inbox while new inboxes spend days to weeks warming up, and usually suggests sending inboxes once you're on a plan. See [the free trial](https://revnu.com/docs/free-trial.md).

## Can I send while they warm up?

Yes, from your own mailbox. Connect Gmail or Outlook in **Connections > Reach People**. On Pro, your own inbox sends up to 50 a day, inside the same sending window. Volume moves to the bought inboxes once they're ready.

![Connections, Reach People: Gmail, Outlook and LinkedIn DMs cards, each with a Connect button](https://revnu.com/docs/screens/connections-reach.webp)

## How do I check their progress?

- **In Inbox.** Open the account menu at the top of **Inbox**. Each sending inbox is listed by its domain, with **Warming up** next to any that aren't ready yet.
- **In chat.** Ask Revnu "are my sending inboxes ready yet?". It tells you what's warming and what's ready.

## How many emails does a sending inbox send?

Each inbox Revnu buys sends 3 emails a day by default, and up to 5, set when Revnu proposes the setup. That's the same on Pro and Managed. More inboxes means more email, and Revnu sizes the setup to your plan.

They send:

- On **weekdays only**, unless you set **Sending Days** to **Every Day**.
- Inside a **sending window**, in each prospect's own time zone, or the time zone you set when Revnu doesn't know theirs. If you haven't set one, it's 8am to 5pm.
- Only to addresses Revnu's check confirms, on every mailbox, your own included. That protects your sender reputation.

To change the window or time zone, open the sequence (on **Leads**, pick the campaign and click the steps pill next to it), then choose **Settings** from the **…** menu. Or tell Revnu, for example "send between 9 and 5 New York time". See [email sending limits](https://revnu.com/docs/email-sending-limits.md).

**Managed only: inboxes Revnu sets up for you**

This is for Managed accounts only. The inboxes Revnu buys through a setup you approve in **Review** send 3 a day each by default, never more than 5, as above, on either plan.

Some Managed accounts send from inboxes Revnu set up and connected for them. Those ramp up gradually as each inbox earns its reputation, and Revnu raises the daily volume for you. Ask Revnu "how many emails a day can my inboxes send?" for today's number. The same weekdays-only rule and sending window apply. A mailbox on your own domain, or a gmail.com or outlook.com address, isn't on this ramp: once Revnu has checked the domain, it sends like an own inbox on Pro, up to 50 a day and 20 an hour.

## What happens when someone unsubscribes?

Emails from Revnu's sending inboxes carry an unsubscribe option. Anyone who uses it goes on your [block list](https://revnu.com/docs/exclude-contacts.md) for good, and Revnu never emails them again.

## Where do replies to these inboxes go?

To **Inbox** in the dashboard, under that inbox's address. Revnu drafts a response for you to approve. See [replies and booking calls](https://revnu.com/docs/replies.md).

## If it doesn't work

| What you see | What to do |
|---|---|
| The proposal failed or never appeared | Tell Revnu. If it didn't know the sender's full name, it needs that first |
| An inbox has said **Warming up** for a long time | Ask Revnu for its status. If something needs attention, Revnu handles it with the team |
| One inbox lags the others | Inboxes warm up independently, so one can still say **Warming up** while others are ready. Ask Revnu for that inbox's status by its address. The ready ones can send meanwhile |
| Revnu said you've hit your plan's inbox limit | Revnu tells you before anything is bought, with what your current inboxes will send once warmed up, which is usually plenty. On Managed, ask your growth engineer about a higher limit |
| Nothing is sending at all | See [why aren't my emails sending?](https://revnu.com/docs/emails-not-sending.md) |

## Next step

[Connect your own inbox](https://revnu.com/docs/connect-email.md) so your first emails go out today.

## Frequently asked questions

### Do I have to pay for the sending domains and inboxes?

No. Revnu pays, within a monthly limit set by your plan. Nothing is bought until you approve the proposal in Review.

### How long does warm-up take before cold emails send?

Days to weeks. The inboxes start outreach once they're authenticated, warmed and checked. Connect your own Gmail or Outlook if you want to send in the meantime.

### How many emails a day will the new inboxes send?

Each one sends a few a day: 3 by default and never more than 5, on weekdays, inside your sending window. More inboxes means more email.

### Can I say no to separate sending domains?

Yes. Reject the proposal in Review. Your outreach can go from your own connected mailbox instead, or from LinkedIn.

### Will the new inboxes send anything during a one-day trial?

Your own Gmail or Outlook sends during your trial. Connect it to see emails go out while the new inboxes spend days to weeks warming up.

### How will I know when the new inboxes are ready?

Revnu messages you once they pass their warm-up and delivery checks, naming the inboxes that are ready for outreach. Until then, ask "when will these inboxes start sending?" for an estimate.

### Why is one inbox still warming up when the others are ready?

Each inbox warms up on its own, so they don't all finish together. Ask Revnu for that inbox's status by its address. The ready ones can send meanwhile.

### Why don't I see warm-up emails in the new inboxes?

Warm-up happens out of sight. Check readiness in the Inbox account menu, where an inbox that isn't ready says Warming up, or ask Revnu for the status.