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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:
ResultMeaningAction
ValidConfirmed deliverableSafe to send
Catch-allDomain accepts all email, can’t confirm individualSend with caution, note in lead record
InvalidDoes not exist or undeliverableDo not send, exclude from list
DisposableTemporary email addressDo not send
Connection: ZeroBounce API key — Settings → Integrations → ZeroBounce → Add API key Example: 
Verify all emails in the lead batch Specter found yesterday before Striker starts outreach.

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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 caseTool
1:1 personalized cold emailGmail (personal sender)
Multi-lead sequences at volumeBrevo (deliverability at scale)
Nurture campaignsBrevo
Transactional (onboarding, alerts)Brevo
Example: 
Send the Day 3 follow-up to all 18 leads in the current sequence via Brevo.