> ## Documentation Index
> Fetch the complete documentation index at: https://docs.open-hive.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Email senders

> Connect mailboxes, set sending identities, and control send volume.

A **sender** is a mailbox your agents send from. Senders live in the
[Inbox](/guides/inbox) section under **Sending profiles**.

## Connecting a mailbox

OpenHive sends through several provider types:

| Provider     | Notes                                                                |
| ------------ | -------------------------------------------------------------------- |
| **Gmail**    | Connect a Google account directly.                                   |
| **SMTP**     | Any SMTP host — `smtp.gmail.com`, `smtp.office365.com`, or your own. |
| **SendGrid** | API-key based.                                                       |
| **Mailjet**  | Needs both an API key and a secret key.                              |

<Warning>
  A sender's provider can't be changed after it's created. To switch providers, delete
  the sender and add it again.
</Warning>

For SMTP you'll need a host, a port between 1 and 65535, and a mailbox password —
usually an **app password** rather than your account password.

## Sending identity

Every sender carries the profile recipients see: a **from-address** (required), a
display name, and a signature. These go on every email that sender sends.

## Controlling volume

Two settings govern how much mail a sender carries:

* **Daily limit** — the maximum this sender sends per day. A whole number, 0 or higher.
* **Rotation weight** — this sender's share when work is spread across several mailboxes.
  A whole number, 0 or higher. Higher weight means a larger share.

Rotation exists because concentrating a campaign on one mailbox is how mailboxes get
flagged. Spreading volume across several, each under its own daily limit, is the safer
pattern.

<Note>
  These limits are per-sender. They work alongside the workspace-level
  [rate limits](/configuration/rate-limits), and the lower of the two applies.
</Note>

## Maintenance

* **Replace password** or **Replace API key** — leave blank to keep the current one.
* **Re-point a sender** at a different connected account if its authorization was
  revoked, instead of rebuilding the sender from scratch.