Keep Your Email Lists Clean, Automatically

Email lists decay at 2-3% per month. People change jobs, abandon inboxes, and domains go offline. Truelist validates your lists on a recurring schedule so you never send to a dead address again.

sync Set it and forget it.: Connect your ESP once and choose a schedule — weekly, biweekly, or monthly. Truelist validates your entire list automatically and flags new problems before your next send.
auto_fix_high Catch what changes between sends.: New bounces, role changes, abandoned mailboxes, newly listed spam traps — your list is always shifting. Recurring validation catches these before they damage your sender reputation.
speed No manual effort required.: No more exporting CSVs, uploading to a tool, and re-importing results. Truelist syncs directly with your platform and handles everything in the background.

Developer API

Your API Keys

Key	Last used
tl_live_sk_a1b2...f6g7	2 hours ago

Quick Example

Response

{
  "email": "test@example.com",
  "status": "ok",
  "score": 95
}

A clean list today is a dirty list in 90 days. Here's what changes between validations.

trending_down 2-3% monthly decay rate: Industry data shows email lists lose 2-3% of valid addresses every month. On a 50,000 contact list, that's 1,000-1,500 addresses going bad every month you don't re-validate.
swap_horiz People change jobs: The average person changes jobs every 2-3 years. When they leave, their work email gets deactivated. That valid address from last quarter is now a hard bounce.
warning New spam traps appear: ISPs recycle abandoned mailboxes into spam traps. An address that was valid six months ago can become a trap that gets your domain blocklisted.
domain_disabled Domains go offline: Companies shut down, rebrand, or change email providers. MX records change. Domains expire. What was deliverable last month may not be today.

Connect your ESP: Link your Mailchimp, Klaviyo, HubSpot, or other platform via OAuth. Truelist pulls your contact lists automatically.
Set your schedule: Choose weekly, biweekly, or monthly validation. Truelist runs automatically in the background — no manual exports or uploads.
Stay clean automatically: After each validation, Truelist flags or removes bad addresses and sends you a summary. Your list stays clean without you lifting a finger.

Each recurring validation checks your entire list for problems that appeared since the last scan.

check Newly bounced or deactivated mailboxes

check Domains with expired or changed MX records

check Recycled spam traps from abandoned inboxes

check Role-based addresses that changed owners

check Newly flagged disposable email providers

check Catch-all domains that stopped accepting mail

Connect once via OAuth. Truelist syncs your contacts and validates them on your schedule.

Set up recurring validation in under 2 minutes. No credit card required.

Can't find the answer you're looking for? Reach out to our support team.

How often should I validate my list?: It depends on your sending frequency and list size. Most teams validate monthly. If you send weekly or have a large list with high churn, biweekly is better. Truelist lets you set whatever schedule fits your needs.
Does recurring validation count against my plan?: Truelist offers flat monthly pricing with unlimited validations. Recurring validation is included on all plans — validate as often as you want without worrying about per-email charges.
What happens to invalid emails found during a scan?: You choose: Truelist can automatically suppress invalid addresses in your ESP, tag them for manual review, or both. After each scan, you get a summary report showing what was found and what action was taken.
Which ESPs support recurring validation?: Recurring validation works with all Truelist integrations: Mailchimp, Klaviyo, HubSpot, ConvertKit, ActiveCampaign, Constant Contact, and more. You can also use the API to build your own recurring schedule.
Can I run a one-time validation alongside recurring?: Yes. You can trigger a manual validation at any time in addition to your scheduled runs. Many teams do an initial deep clean, then set up recurring validation to keep things maintained automatically.