Clean your subscribers before importing into MailerLite

Why MailerLite reviews the lists you import

MailerLite has a reputation for strong deliverability, and it defends that reputation by vetting new accounts and scrutinizing imported lists. Import a list that looks purchased, stale, or full of role and disposable addresses and your account can be held for review or rejected outright. The platform would rather turn away a risky list than let it bounce and drag down the shared sending reputation its other customers rely on.

Most creators and small businesses on MailerLite aren't sending shady lists on purpose — they just have subscribers collected over years, a form without spam protection, or an export from a previous tool. Those lists quietly accumulate typos, abandoned mailboxes, and generic role addresses. When you import them, the quality signals MailerLite checks for look bad, and even if you pass review, the first campaign bounces and hurts your placement.

Verifly checks every address with a live mailbox probe and returns deliverable, undeliverable, or risky, plus disposable, role, and catch-all flags. Clean the list first, import only deliverable subscribers, and both MailerLite's review and your inbox placement come out clean.

Verify before the MailerLite import

1. Export the subscribers you plan to import as a CSV with an email column.
2. Grab a free key at verifly.email/api/v1/autonomous/register (100 credits, no card, no captcha).
3. POST the email column to /verify/batch, chunking large newsletters into batches.
4. Keep deliverable rows and strip undeliverable, disposable, and generic role addresses that hurt list-quality signals.
5. Import the clean CSV into MailerLite and let your welcome automation run against real subscribers.

const emails = subscribers.map(s => s.email)

const res = await fetch('https://verifly.email/api/v1/verify/batch', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer vf_your_api_key',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ emails }),
})

const { results } = await res.json()
const clean = results.filter(
  r => r.result === 'deliverable' && !r.role && !r.disposable
)
console.log(`Importing ${clean.length} quality subscribers into MailerLite`)