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

# Channels overview

> Email, SMS, web push and voice — one audience, four ways to reach it.

Senderz sends on four channels. Every channel shares the same contacts, the same suppression list, the same consent model and the same compliance gates — you build the audience once and choose how to reach it.

<CardGroup cols={2}>
  <Card title="Email" icon="envelope" href="/en/channels/email">
    Marketing and transactional email with per-tenant DKIM, a failover
    provider chain and built-in open/click tracking.
  </Card>

  <Card title="SMS" icon="comment-sms" href="/en/channels/sms">
    Wallet-gated SMS through Israeli carriers, with approved sender IDs and
    STOP handling.
  </Card>

  <Card title="Web push" icon="bell" href="/en/channels/push">
    Self-hosted Web Push (VAPID) with per-endpoint subscriptions and
    revocation.
  </Card>

  <Card title="Voice" icon="phone" href="/en/channels/voice">
    Text-to-speech voice calls as a flow node and for OTP delivery.
  </Card>
</CardGroup>

## Consent is per channel

A contact can be subscribed to email but not SMS, or the reverse. Each channel tracks its own consent state (`subscribed`, `unsubscribed`, `never_subscribed`, `cleaned`) with its own timestamp and source. Marketing sends check the state for **that** channel only.

## Compliance differs by channel

<Warning>
  Marketing **SMS, voice and push** to Israeli numbers are blocked during
  quiet hours (20:00–08:00 local) and Shabbat. **Email is exempt** from the
  legal block by product decision — the merchant decides when their marketing
  email fires. See [Israeli compliance](/en/compliance/israel).
</Warning>

## Cost model

| Channel  | Per-message cost            | Gate                             |
| -------- | --------------------------- | -------------------------------- |
| Email    | Sending-infrastructure only | Verified domain                  |
| SMS      | Carrier cost per segment    | SMS credit wallet                |
| Web push | None                        | Verified VAPID subscription      |
| Voice    | Carrier cost per call       | SMS credit wallet (segment rate) |

<Note>
  SMS and voice draw down your **SMS credit wallet**. Top it up with credit
  packs; the wallet refuses to go negative and refunds on hard provider
  failure. See [SMS](/en/channels/sms).
</Note>