> ## Documentation Index
> Fetch the complete documentation index at: https://docs.51ultron.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Data Integrations

> ZeroBounce and Brevo.

## ZeroBounce

Email verification before any outreach. ZeroBounce checks every email Specter finds before Striker sends.

**What Ultron can do:** Verify email addresses with deliverability scoring.

**Verification results:**

| Result     | Meaning                                            | Action                                 |
| ---------- | -------------------------------------------------- | -------------------------------------- |
| Valid      | Confirmed deliverable                              | Safe to send                           |
| Catch-all  | Domain accepts all email, can't confirm individual | Send with caution, note in lead record |
| Invalid    | Does not exist or undeliverable                    | Do not send, exclude from list         |
| Disposable | Temporary email address                            | Do not send                            |

**Connection:** ZeroBounce API key — Settings → Integrations → ZeroBounce → Add API key

**Example:**

```text theme={null}
Verify all emails in the lead batch Specter found yesterday before Striker starts outreach.
```

***

## Brevo

Brevo handles volume email sending — sequences, campaigns, and transactional messages.

**What Ultron can do:** Send transactional emails, send marketing campaigns, manage sender domain configuration, track delivery and opens.

**Connection:** Brevo API key + domain verification — Settings → Integrations → Brevo → Add API key

**Gmail vs Brevo:**

| Use case                           | Tool                            |
| ---------------------------------- | ------------------------------- |
| 1:1 personalized cold email        | Gmail (personal sender)         |
| Multi-lead sequences at volume     | Brevo (deliverability at scale) |
| Nurture campaigns                  | Brevo                           |
| Transactional (onboarding, alerts) | Brevo                           |

**Example:**

```text theme={null}
Send the Day 3 follow-up to all 18 leads in the current sequence via Brevo.
```