Migrate from Constant Contact to Relayly

Why teams leave Constant Contact

Pricing climbs hard with list size. Constant Contact bills by contact count. Lists in the 50k+ range often pay 2-3x what Relayly charges.
API is limited. REST API exists but doesn't cover the full feature set. Most automation must go through the UI.
Limited deliverability transparency. No per-IP reputation, no provider routing, no inbox-preview integration.
Single region. No EU data residency option.

What carries across

Constant Contact concept	Relayly equivalent	Auto-migrates?
Contacts (CSV export)	`contacts`	Yes — auto-detected by our import script.
Lists	`lists`	Yes — CSV-mapped on import.
Email templates	`email_templates`	HTML carries directly. Drag-drop layouts re-render in our editor.
Suppressions	`Suppressions`	Manual export from Constant Contact, single CSV import.
Custom fields	`Custom fields`	Yes — dynamic schema.

The codebase swap

API shapes are similar enough that find/replace handles most call sites. The key differences:

# No first-party SDK; raw curl
curl -X POST \
  "https://api.cc.email/v3/contacts" \
  -H "Authorization: Bearer $CC_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"email_address":{"address":"u@example.com"}}'

# Relayly REST
curl -X POST \
  "https://api.relayly.io/v1/contacts" \
  -H "X-API-Key: $RELAYLY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"email":"u@example.com","list":"<list_id>"}'

CSV-driven path

Most Constant Contact migrations don't need API integration — they go through CSV. Export your contacts from Constant Contact (Contacts → Export → CSV), and run our importer:

./scripts/import-contacts-csv.sh $RELAYLY_ACCOUNT_ID $LIST_ID contacts.csv

The importer auto-detects Constant Contact's column shape and dedups against existing contacts. Re-runs are idempotent.

The cutover playbook

Run the export script. It's read-only against Constant Contact and re-runnable.
Review the manifest. Anything flagged as "needs review" gets a copy-paste remediation snippet.
Apply to Relayly. Idempotent SQL + REST imports. Re-run safely.
Dual-send for a week. Compare inbox rates at Gmail / O365 / Yahoo through the dashboard.
Flip the API key. Search-and-replace your codebase, deploy, monitor 24h.
Pause Constant Contact. Don't delete the account — keep it for 30 days as an unsubscribe-list reciprocity reference.
After 30 quiet days, terminate Constant Contact. You're done.

Pricing-side check

Volume	Constant Contact	Relayly	Annual delta
5k contacts	$45/mo (Lite)	$25/mo	+ $240/year
25k contacts	$110/mo (Standard)	$25/mo	+ $1,020/year
50k contacts	$225/mo	$100/mo	+ $1,500/year

Constant Contact pricing as of 2026-05. Contact-based pricing model creates large gaps at scale.

Start the migration

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