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Mailchimp is a narrower integration than Klaviyo. It gives LTV.ai your audiences and keeps unsubscribes aligned between the two systems.

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Connect

Go to Settings > Connections and open Mailchimp. Authorize the connection with your Mailchimp account.

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What it does

Audiences as campaign targets

Your Mailchimp audiences and segments appear as selectable lists when you pick a campaign audience.

Bidirectional unsubscribe sync

Someone who unsubscribes in Mailchimp stops receiving LTV.ai email, and someone who unsubscribes from an LTV.ai send is pushed back to Mailchimp.
Unsubscribe sync also runs every time you upload a list, so an imported CSV cannot reintroduce someone who has already opted out.

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What it does not do

LTV.ai cannot send through Mailchimp. Campaigns are sent through LTV.ai’s own infrastructure. If Mailchimp is your sending platform, use it as an audience and suppression source, and set up an LTV.ai sending domain for the sends themselves. See Set up your sending domain.
Mailchimp is not offered during onboarding. Connect it afterwards under Settings > Connections.

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Mailchimp or Klaviyo?

They are not equivalent integrations, so it is worth knowing which you have. If you use both, Klaviyo is the richer connection and the one worth setting up first.

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Troubleshooting

If a Mailchimp audience is missing from the picker, it is usually because the audience is empty, or because the sync has not completed since you created it. Empty lists are hidden from the audience picker by design. See How audiences work.