How to verify emails for Instantly campaigns

To keep Instantly campaigns healthy, verify your list before you upload it, not after. Paste or drop your CSV into a free email verifier, remove Invalid and Risky addresses, then import only Deliverable contacts. Clean lists hold bounce rates under 2% and protect sender reputation on new domains.

Why bounce rate makes or breaks Instantly campaigns

Instantly runs on mailbox rotation and gradual warmup. Every send builds or drains the reputation of a new domain. Mailbox providers watch your bounce rate closely. A cold list stuffed with dead addresses tells Gmail and Outlook you are guessing, and guessing looks like spam. Keep hard bounces under 2% and you stay in the inbox. Cross 5% and Instantly may auto-pause the campaign to protect your sending accounts. The fix sits upstream: verify before the list ever touches your sequence.

Cold outreach lives or dies on that first impression with the receiving server. A high bounce rate on day one signals a list you never checked, and providers treat unchecked senders as suspicious. New domains have no track record to fall back on, so a single bad batch weighs far more than it would on an aged, trusted domain. Clean data is the cheapest deliverability insurance you can buy, and it costs nothing to run a list through a free check first.

How do you verify emails instantly before importing to Instantly?

Run your raw list through a verifier first. A local safety scan strips bad syntax, duplicates, and disposable domains without touching quota. The rest get MX-record and SMTP-level checks. Keep only Deliverable results, review Risky ones, drop everything Invalid, then export a clean CSV for Instantly.

1. Export your leads from your CRM or scraper as a CSV.
2. Open the Free Email Verifier and drop the file in. It parses in your browser, so the list is never uploaded anywhere.
3. Let the local scan flag syntax errors, duplicates, and disposable domains instantly, before any quota is used.
4. Run MX and SMTP checks on the remaining addresses to confirm the mailbox exists.
5. Apply typo suggestions where a domain looks close but wrong (gmial.com, outlok.com).
6. Export the Deliverable-only set as CSV or JSON.
7. Import that clean file into Instantly and map your fields.

The whole pass takes minutes, not hours. Because the CSV is parsed in your browser and never uploaded, you get results instantly without handing your prospect list to a third-party server. The local safety scan does the obvious cleanup for free, so your daily quota only gets spent on addresses that actually need a live mailbox check. That is the difference between a list you hope is clean and one you know is clean before it enters Instantly.

What each verdict means for your Instantly list

Not every address sorts into pass or fail. A good verifier returns four verdicts, and each one deserves a different action before import. Deliverable is safe to send. Invalid will bounce, so cut it. Risky and Unknown need judgment, and how aggressive you are depends on how new your sending domain is.

Risky is the verdict that trips people up. A catch-all domain accepts mail for any address, so the server cannot confirm the specific mailbox exists. Some catch-alls are real inboxes, others are traps. On an established domain you can test small batches of Risky contacts and watch the response. On a domain younger than a month, leave them out entirely. Role addresses and disposables also land here, and neither belongs in an early cold sequence. When in doubt, exclude the Risky segment from your opening send and revisit it after the domain warms.

Bounce thresholds worth respecting on cold domains

Numbers keep you honest. On a fresh domain, aim for a bounce rate under 2% across your first sends. Under 3% is workable once the domain has history. Anything above 5% is a red flag that mailbox providers act on fast. A single unverified 2,000-address batch can blow past that line in one morning. Verifying first is cheaper than repairing a burned domain, which can take weeks of warmup to recover. Treat 2% as your ceiling, not your target, and you will rarely see a campaign paused.

Should you import Deliverable addresses only?

For a new domain, yes. Import only Deliverable addresses for your first few weeks of sending. Once the domain has a clean track record and steady engagement, you can layer in small, tested batches of Risky contacts. Never send to Invalid or Unknown addresses on a cold domain.

Build verification into your Instantly routine

Cleaning once is not enough. B2B data decays fast. People change jobs, companies fold, and mailboxes get retired, so a list that verified clean in January will carry dead addresses by spring. Re-verify any list older than 90 days before you reload it. If you pull leads in small daily batches, verify each batch the same day you scrape it. The free daily limit covers most solo senders, and the browser-side parsing means your prospect data never leaves your machine.

Segmentation helps too. Keep verified lists separate by source and by verification date so you always know what has aged. When you spin up a new sending domain in Instantly, feed it only your freshest, cleanest Deliverable contacts and grow volume slowly. Save older or Risky segments for domains that already have a warm reputation. A simple naming convention, like source-date-verified, saves you from accidentally reloading a stale list into a campaign that took weeks to warm up.

Mistakes that quietly spike your bounce rate

A few habits sink campaigns even after verification. Sending to every Risky address on a two-week-old domain is the most common. Role accounts like info@ and sales@ pull low engagement and sometimes trigger filters, so hold them for warmer domains. Skipping typo correction wastes real prospects behind a misspelled domain. And importing straight from a scraper without any check at all is the fastest way to a 10% bounce rate and a paused campaign. Track your bounce rate after every send and re-clean the moment it drifts toward 3%. Verify first, send second.