# Connect a mailbox and send safely | Propel guides

Source: https://runpropel.com/guides/mailbox

Getting started · 3 of 6

# Connect a mailbox and send safely.

Cold email from Propel goes out from your own mailbox, one person at a time. Each mailbox has a daily limit and sends are spaced out. People who bounced or asked not to be contacted are skipped. Every email waits for your yes, and cold email can never run fully on its own.

Opening soon Propel isn't open for sign-up yet. This guide shows how it works on day one. [Join the waitlist](https://runpropel.com/waitlist) to get in first.

## How do you connect a mailbox?

- Add the mailbox's sending details: the mail server, the port, and an app password from your email provider.

- Add its incoming details too, so replies can be read and sorted.

- Run the domain check. It looks at your SPF, DKIM and DMARC records, so mail providers can tell the email really comes from you.

## How does it keep your mailbox healthy?

- A daily limit per mailbox , 30 unless you change it. When one mailbox reaches its limit, another connected mailbox takes over.

- Spaced-out sends , roughly a minute apart, never a burst.

- A do-not-contact list. Addresses that bounced, were invalid, or asked to stop are skipped, checked when the list is built and again at the moment of sending.

- A wording check on each draft for phrases that trip spam filters.

- Open and click tracking is off unless you turn it on.

## Does anything send without you?

Not at first. Cold email starts at "It drafts, you approve". On results it can reach "It posts unless you stop it", where each email waits an hour so you can stop it. It never runs fully on its own. [How a channel earns a step](https://runpropel.com/guides/channel-steps).

## What happens when someone replies?

The reply is matched to the conversation and sorted: interested, asking about price, an objection, not now, a referral, or asking to stop. Any reply stops the follow-ups to that person. Someone who asks to stop, or says now is not the time, is marked do-not-contact.

Propel never emails people it found through GitHub.

Getting started

- [Start with your website](https://runpropel.com/guides/start)
- [Connect GitHub, read-only](https://runpropel.com/guides/github)
- [Connect a mailbox and send safely](https://runpropel.com/guides/mailbox)
- [How credits work](https://runpropel.com/guides/credits)
- [How channels earn more freedom](https://runpropel.com/guides/channel-steps)
- [Approvals from Slack and email](https://runpropel.com/guides/approvals)

See also

- [Approvals and limits](https://runpropel.com/approvals)
- [Pricing](https://runpropel.com/pricing)

## Questions about this guide

### Can I connect more than one mailbox?

Yes. Each has its own daily limit, and sending moves to the next mailbox when one reaches its limit.

### Does it use my Gmail for cold email?

Cold email goes out through your own mailbox, signed in with an app password you make for Propel. If you also connect Google, it can email one person from your Gmail when you ask, and it asks you first each time.

### What stops a sent email from being a mistake?

Every claim is checked against a source before you see it, and every email waits for your yes until the channel has earned more freedom. A sent email cannot be unsent, so cold email always leaves time to stop it.