Keep your Formstack submissions clean and deliverable
Formstack captures submissions, fires notification and confirmation emails, and pushes data to your CRM or email tool, but it never checks whether the address someone typed can actually receive mail. A single typo or throwaway domain rides straight through to your lists. Qualisend closes that gap: export past submissions to a CSV and clean them in one pass today, and verify every new submission at the point of capture through the REST API while the native connector is on the way.
The Formstack connector is coming soon
A native one-click Formstack connector — connect, clean your list in place, and verify new contacts automatically — is being built right now. It's on the way, not deprecated. In the meantime, everything you need to keep Formstack clean already works.
The CSV export → verify → reimport loop below, and the API for verifying at signup, are both fully supported and running in production — that's how teams keep Formstack clean today.
What Formstack cleans for you
Formstack's email hygiene is limited to delivery, not validity. Notification emails go to your team and confirmation emails go to the submitter, and you can route both through your own SMTP server for better inbox placement. But Formstack stores each submission as an immutable record: there is no mailing list, no subscriber status model, and no bounce-driven suppression the way an ESP has. If a confirmation email bounces, Formstack does not flag the address, quarantine it, or stop it from flowing downstream.
What it can't catch
Because Formstack only reacts once an email has been sent and bounced, it never catches the addresses that were bad from the moment they were typed. It cannot tell a real inbox from a typo like gmial.com, a disposable domain spun up to grab a lead magnet, a role address such as info@ or support@, a mailbox that has since been abandoned, or a catch-all domain that accepts everything and proves nothing. Submissions imported from an older tool or a spreadsheet arrive with any prior bounce history stripped, so even known-bad addresses look fresh. Every one of these sits in your submissions until a real campaign hits it and the damage is already done.
Why a clean Formstack list matters
The addresses you collect in Formstack rarely stay in Formstack; they sync to a CRM or ESP and get mailed, so their quality becomes your sender reputation. Gmail and Yahoo's 2024 bulk-sender rules require complaint rates under 0.3% and punish senders who repeatedly hit dead mailboxes, and a batch of form-captured typos and disposables is exactly what tips you over. Downstream, many email platforms bill per contact, so every invalid address you pass along is a line item you pay for and a deliverability risk you carry. Verifying at capture keeps the junk out before it ever costs you money or inbox placement.
The workflow that works today
Forms are about capture, not cleanup: the win is verifying each address the moment it is submitted so bad data never reaches your lists in the first place.
Export submissions to CSV
On a form's Submissions page, open Table Settings to move the email field into Visible Columns, then use Export All (or All data since last download) and choose CSV.
Verify the file in Qualisend
Upload the CSV as a bulk job of up to 1,000,000 addresses. Duplicates are charged once, progress is live, and your first 100 credits are free and never expire.
Read the results
Every address comes back as deliverable, risky, undeliverable, or unknown, each with a reason code, sub-flags for catch-all, disposable, role, and full mailbox, the MX provider, an SMTP probe as evidence, and a 0–100 confidence score.
Act on the cleaned file
Formstack submissions are locked records, so you clean at the handoff: filter the cleaned CSV to deliverable rows before importing into your CRM or ESP, drop undeliverable and disposable, and tag catch-all and role addresses for separate handling.
Or automate it at signup
Instead of exporting after the fact, verify at the point of capture: fire a Formstack submission webhook into a Zapier, Make, or n8n flow that calls the Qualisend REST API, or hit the API directly, so typos and disposable addresses are caught before the record ever syncs to your CRM. Scoped keys, rate limits, and webhooks make it a clean, auditable step in the flow.
What Qualisend flags on every address
- Never-mailed invalids — typos and dead addresses that passed Formstack's field validation but would hard-bounce on your next send
- Disposable and throwaway domains people use to grab a lead magnet and never check again
- Role addresses like info@, support@, and sales@ that route to shared inboxes instead of a real person
- Catch-all domains flagged so you can segment or throttle them, since the server accepts every address and proves none
- A 0–100 confidence score and a machine-readable reason code on every address, backed by the SMTP probe as evidence
A native one-click Formstack connector is on the way — it's being built now, not deprecated. Until it ships, the CSV loop above and the API are the fully supported path, and they work with any Formstack plan.
What to do with each result
Every address comes back with a verdict and sub-flags. Here's the action that keeps your Formstack list clean without throwing away contacts you can still reach.
deliverableKeep and sync the submission to your CRM or email list with confidence.deliverable + role flagKeep, but tag it: route info@ and support@ shared inboxes away from one-to-one sequences.risky + catch-all flagSegment and throttle. The domain accepts everything, so there is no per-mailbox proof it lands.risky + disposable flagDrop it, and block the throwaway domain at capture so it stops recurring.unknownHold and re-verify later. Do not sync it downstream until it resolves.undeliverableSkip it entirely and suppress it in your CRM or ESP. Never import it into a send.Related reading
Wire real-time verification into a Formstack submission so bad addresses are caught at capture, not after a bounce.
Connect a Formstack submission trigger to Qualisend in Zapier and screen every new address before it hits your CRM.
Formstack's field check confirms an address is shaped right, not that the mailbox exists — here's the difference.
How the four verdicts, sub-flags, and SMTP evidence actually determine whether an address can receive mail.
Scoped keys, rate limits, and webhooks for verifying Formstack submissions at the point of capture.
Formstack verification FAQ
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