Roughly 40% of your email recipients never open the message. Most brands just resend it or move on. Your paid ads have the opposite problem: custom audiences built from a CRM export go stale the moment someone opens, clicks, or buys through email.
The fix treats email engagement as a live targeting signal for your ad platforms. That's what email campaign automation means in 2026 — not just drip sequences, but a two-way data pipe between your email tool and every ad platform you run.
The Three Email→Ads Workflows Worth Automating
Three workflows turn email signals into ad performance. Each one targets a different leak in your funnel.
Workflow 1: Retarget Email Non-Openers with Paid Ads
Retarget everyone who received your email but didn't open it within three days. Same offer, new channel, different creative format — it reaches people who tuned out the inbox without adding frequency for people who already engaged.
Pull your delivered-but-not-opened contacts, upload them as a Custom Match audience on Meta or Google, and run email-matched creative. Expect a 15–30% lift in incremental conversions over no follow-up at all.
Agent prompt
“Get everyone who received my June 15 newsletter but didn't open it, then push them to Meta as a retargeting audience called 'June 15 Non-Openers'”
Workflow 2: Suppress Email Converters from Cold Ad Audiences
Stop paying $8–12 CPM to show ads to people you already converted through email. The moment someone clicks or converts via email, add them to an exclusion list on every cold prospecting campaign.
Route your email.clicked events into a Custom Audience and apply it as an exclusion on prospecting. That budget now hunts new customers instead of chasing existing ones.
Agent prompt
“Exclude everyone who clicked the pricing link in last week's campaign from our Meta prospecting audiences”
Workflow 3: Seed Lookalikes from Email Clickers
Email clickers are the strongest lookalike seed you have — more intent than all-visitor or all-subscriber lists. Pull email.clicked events from the last 30–90 days and upload them as a seed to Meta, Google, or LinkedIn's lookalike builder.
Match quality runs 2–4× better than a cold CRM upload. The people who clicked your email already raised their hand — the platforms find others who look like them.
Agent prompt
“Build a 1% lookalike on LinkedIn from everyone who clicked any email in the last 60 days”
How to Set This Up in Synter
Synter connects to your email platform via webhook and your ad platforms via OAuth. Once both are connected, the AI agent handles the rest — no code, no manual exports.
Step 1: Connect Loops
Go to Settings → Credentials and connect your Loops workspace with your API key. Once connected, a Webhook section appears at the bottom of the Loops card.
Step 2: Configure the Webhook in Loops
Copy the webhook URL and signing secret from the Synter credentials card. In your Loops dashboard, go to Settings → Webhooks, add the endpoint, and enable these events:
email.openedemail.clickedemail.deliveredemail.softBouncedemail.hardBouncedemail.unsubscribed
Step 3: Use the Agent
Once events start flowing, ask the agent in plain language. The get_email_engagers tool filters by campaign ID, date range, and event type. Chain it to sync_audience and the contacts upload to your ad platform automatically.
Example session
You: “Get everyone who opened the June 20 campaign and push them to Google Customer Match”
↓ agent calls get_email_engagers → sync_audience
Agent: “Synced 847 contacts to Google Customer Match as 'June 20 Openers'. Audience is processing (typically 24–48h for Google to activate).”
Platform-Specific Notes
Meta (Facebook & Instagram)
Custom Audiences from email lists match 40–60% of contacts on average. Create one audience for retargeting non-openers and a separate exclusion audience for converters. Feed clicker lists into a 1% lookalike to expand reach without sacrificing quality.
Google Ads
Customer Match accepts hashed email lists for Search, Display, and YouTube targeting. Use email segments as Remarketing Lists for Search Ads (RLSA) to bid higher on people who already engaged with your content.
LinkedIn's Matched Audiences maps your email list to company and member profiles — which makes email clickers ideal for account-based campaigns. Run retargeting through Sponsored Content and exclusions on Lead Gen Forms.
Why Dedicated Email Platforms Can't Do This Alone
Klaviyo, Mailchimp, ActiveCampaign, HubSpot, and Brevo all automate email sequences well. None of them natively sync engagement signals back to your ad platforms in real time.
The missing piece is an ads-native platform that ingests email webhooks and speaks Custom Match upload. Most email platforms treat ads as a one-way outbound channel: build your list in the ad platform, import it to email. Synter runs the loop in both directions.
Getting Started
Connect Loops under Settings → Credentials, configure the webhook, and run your first email-to-ad sync in under five minutes. The three workflows above — retarget non-openers, suppress converters, seed lookalikes — are all available immediately through the Campaign IDE agent.
See the Loops integration docs for the full setup guide including webhook configuration and all available agent tools.