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Constant Contact is fine for local businesses and nonprofits with simple needs. When you start hitting the ceiling — weak e-com integration, limited automation logic, dated templates — migration is on the table. Here's when to go, where to go, and how to do it without trashing your deliverability.
Who this is forConstant Contact account holders considering Klaviyo, Mailchimp, ConvertKit, or ActiveCampaign. This tutorial covers the DECISION, the prep, and the deliverability handoff — not the destination tool's setup.
What you'll need
Step 1
Constant Contact is fine for many SMBs. Migrate only when a specific gap is hurting you.
GAP 1 — E-commerce depth: Constant Contact's e-com features are weak. If email is over 15% of your e-com revenue and you want to push to 25%+, Klaviyo or Mailchimp will outperform.
GAP 2 — Automation depth: Constant Contact automations are simpler than Mailchimp Customer Journeys or Klaviyo Flows. If you need complex branching, multi-trigger flows, or split-test automations, migration unlocks them.
GAP 3 — Modern templates and design: Constant Contact templates lean dated. If your brand is design-forward and templates feel like a constraint, Mailchimp or ConvertKit are visually more modern out-of-the-box.
GAP 4 — Pricing at scale: Constant Contact pricing climbs fast above 25K contacts. ConvertKit, Mailchimp, and Klaviyo are often cheaper at 50K+. Run the math: total monthly cost on each tool at your projected 12-month contact count.
If none of these gaps apply, DO NOT MIGRATE. Constant Contact will be fine. Migration is a 6-8 week project that costs 30-50% of email revenue if botched.
Step 2
Klaviyo for e-com. Mailchimp for general SMB upgrades. ConvertKit for creators. ActiveCampaign for complex automation.
KLAVIYO: best for e-commerce (Shopify, WooCommerce, BigCommerce). Deeper events, Predictive Analytics, RFM segmentation. Pricing similar to Constant Contact at low volume, often cheaper at scale.
MAILCHIMP: best for general SMB upgrades — modern templates, Customer Journeys, broader integration ecosystem. Pricing competitive with Constant Contact.
ACTIVECAMPAIGN: best for B2B/SaaS or complex automation needs. Strongest automation builder in the market. Good for sales-driven follow-up sequences.
CONVERTKIT: best for creators, course sellers, newsletter operators. Simple, fast, opinionated for creator workflows. Lacks e-com depth.
For 60% of Constant Contact users migrating, the answer is Mailchimp (general SMB) or Klaviyo (e-com).
Step 3
Before exporting anything, write down everything you're recreating: lists, tags, segments, automations, signup forms.
Contacts → All Contacts → note total active count.
Contacts → Lists → list all lists with member counts.
Contacts → Tags → list all tags.
Contacts → Segments → screenshot each segment definition (you'll recreate the logic in the new tool).
Campaigns → Automations → list each active automation. Screenshot triggers, delays, and email content.
Sign-up Forms → list all forms with embed locations.
Events (if used) → list active events and registration counts.
Save all screenshots to a shared folder. The migration will reference these for 2-4 weeks.
Step 4
Contacts → All Contacts → filter to Active → Export. NEVER export Unsubscribed or Bounced.
Contacts → All Contacts.
Filter to status = Active ONLY. Skip Unsubscribed, Bounced (hard), and Removed.
Click Export → choose all fields including tags + custom fields.
Download the CSV when ready (Constant Contact emails it; usually 5-30 minutes).
Open the CSV. Confirm columns: Email Address, First Name, Last Name, plus any custom merge fields and tags.
Importing Bounced (hard-bounced) contacts to the new tool will spike bounce rate from Day 1. Importing Unsubscribed will spike complaint rate. Both damage reputation immediately — that's why we only export Active/Subscribed.
Step 5
In the new tool, configure DKIM, SPF, DMARC on a NEW sending subdomain. Don't reuse your Constant Contact subdomain.
In the new tool (Klaviyo/Mailchimp/ConvertKit), navigate to domain settings.
Create a new sending subdomain: e.g., if Constant Contact used send.yourbrand.com, use news.yourbrand.com or email.yourbrand.com for the new tool.
Add the DKIM CNAME records the new tool provides.
Add SPF entry to your DNS: include the new tool's SPF mechanism alongside your existing records.
Update DMARC if needed (usually p=none initially with the new sending mechanism).
Wait 24-48 hours for DNS propagation. Verify all three via mxtoolbox.com BEFORE any sends.
Step 6
Import only opted-in contacts. Send only to engaged 30d for the first 14 days. Scale gradually.
Import the CSV to the new tool. Map columns carefully: Email → email, First Name → first_name, Constant Contact Tag → custom property or tag.
Mark consent honestly: "These contacts opted in via Constant Contact signup forms" with the date range.
Build the equivalent of your Constant Contact segments in the new tool (using screenshots from Step 3).
WARMUP SCHEDULE:
- Week 1: send only to most-engaged 10% (opened or clicked in last 30 days). Volume: 500-1K/day.
- Week 2: expand to engaged 25%. Volume: 1K-5K/day.
- Week 3-4: expand to engaged 50%. Volume: 5K-15K/day.
- Week 5-6: full engaged 90-day list. Volume: 15K-50K/day.
Monitor open rate weekly. Should be 25%+ on engaged segments. Below 20% means auth or content has an issue — pause and diagnose.
Step 7
Keep Constant Contact active for new signups during cutover. Disable automations only after the new tool is fully running.
Cutover signup forms: switch website embeds + popups to point to the new tool. New signups flow there.
Constant Contact: pause all automations. Keep account active to receive any signups not yet cutover (third-party integrations, lead magnets, etc.).
In the new tool: activate the equivalent Welcome flow, Birthday, Anniversary, Re-engagement, Abandoned Cart (if e-com).
After Day 30 of clean dual operation, audit: are any signups still arriving in Constant Contact? Find the source and cut over.
After Day 60: cancel or downgrade Constant Contact. Archive the account if pricing allows — historical campaign data is sometimes useful for reference.
Common mistakes
Migrating without warming up the new platform
What goes wrong: Cold list + new IP + 50K sends in one day = guaranteed deliverability damage. Open rate drops from 22% to 10-12%. Recovery takes 60-90 days. This is the most expensive migration mistake — $2K-10K in lost revenue depending on list size.
How to avoid: Warm up for 14-30 days using engaged segments only. No mass-list campaign for at least 30 days. New tool reputation needs time to build with mailbox providers.
Importing Bounced and Unsubscribed contacts
What goes wrong: Re-introducing hard-bounced emails spikes bounce rate. Re-introducing unsubscribes spikes complaint rate. Both damage reputation from Day 1. Reputation recovery takes 30-90 additional days.
How to avoid: On Constant Contact export, filter to Active ONLY. On import to new tool, verify count matches Constant Contact's Active total. Never check "all contacts."
Not setting up DKIM/SPF/DMARC on the new tool BEFORE first send
What goes wrong: Auth records still configured only for Constant Contact. New tool's emails fail auth, land in spam at scale. Open rate drops to 5-10%. Wasted send credits + reputation damage on the new platform.
How to avoid: Authenticate the new sending subdomain BEFORE the first send. Verify via mxtoolbox.com. Add new SPF mechanism without removing the Constant Contact one (run both during parallel period).
Cutting Constant Contact off too early
What goes wrong: In-flight Constant Contact automations break mid-flow. Customers receive partial sequences. Brand looks broken. New tool doesn't have time to fully take over.
How to avoid: Run both platforms in parallel for 30-60 days. Constant Contact finishes existing flows. New tool handles all new signups + new automations. Cut over only after 30 clean days of dual sending.
Skipping re-permission for EU/UK contacts
What goes wrong: Constant Contact opt-in may have been less explicit than the new tool requires. Importing without re-confirming consent triggers GDPR compliance risk. EU subscribers can file complaints — €20K+ fines.
How to avoid: For EU/UK/Canada subscribers, send a re-permission email before importing: "We're moving — confirm you want to keep hearing from us." Suppress non-responders. Yes, you'll lose 30-50% of EU list — that's the cost of clean consent.
Migrating for the wrong reasons
What goes wrong: Migrating because a competitor mentioned Tool X, or because you saw a discount code. You spend 6-8 weeks on a migration that doesn't address your actual problem. Two months of opportunity cost — $5K-20K depending on revenue scale.
How to avoid: Before migrating: identify the SPECIFIC gap Constant Contact can't fill. If you can't name a concrete gap that's costing revenue, don't migrate.
Recap
Done — what's next
Why your Constant Contact open rate dropped — and how to fix it
Read the next tutorial
Hand it off
Migrations are the most likely email project to cause permanent revenue damage if done wrong. A specialist who's done 20+ migrations will do this in 2-3 weeks of focused work, typically $800-1,500 at $14-16/hr. Alternative: 60-90 days of half-revenue while you DIY-recover.
See specialist rates
2-3 weeks for build (export, import, recreate segments + automations) plus 30-60 days of parallel running before fully cutting Constant Contact. Total elapsed: 8-12 weeks. Active work: 6-10 hours.
Some — but not from the migration itself. You'll lose 20-30% during the warmup phase (cold segments don't see your initial sends). Another 5-10% if you re-permission for GDPR. After 90 days, your active list is usually 60-75% of original — and healthier than a 100% list with 50% disengagement.
Mailchimp if you're general SMB (newsletters, basic e-com, nonprofit). Mailchimp has Customer Journeys and broader integration ecosystem. Klaviyo if you're e-commerce-heavy (Shopify, WooCommerce, BigCommerce) and want deep purchase-event automation. Both are upgrades over Constant Contact for the right use case.
Not directly — automation logic doesn't transfer. But the TRIGGERS and EMAIL CONTENT do. Use your Constant Contact screenshots from Step 3 as a spec, then build equivalent flows in the new tool. Plan 1-2 hours per automation to rebuild.
If Events is core to your business, this is harder. Most other ESPs don't have native event tools — you'd need a separate tool like Eventbrite or Cvent and connect via Zapier. Factor this into the migration decision. Some accounts keep Constant Contact JUST for events and migrate everything else.
Yes — larger lists need more careful warmup. Plan 30 days of engaged-only sending instead of 14. Volume scaling takes 30 days, not 14. Total migration timeline extends to 10-14 weeks. Strongly recommend hiring a specialist for 25K+ migrations.
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