Keep your Iterable audience clean before it costs you an MAU
Iterable automatically unsubscribes an address the moment it hard-bounces, so it stops mailing a known-bad mailbox after the first failure - but it can't judge a profile it has never messaged. And because Iterable is event-driven, it mints a user the instant your app or SDK fires an identify or track call, so never-messaged invalids from imports, product events, and signup typos pile up unseen - each one a wasted send and a reputation hit on its first campaign. Qualisend closes that gap: connect Iterable to verify the users in any list and save each result as a data field, then suppress or delete the dead ones before your next send. Here's how, plus the export, API, and no-code options.
Connect Iterable directly, no CSV needed
All you need is an API key
Paste your Iterable API key and pick your region (US or EU). Find it in Iterable under Settings → API Keys.
- Clean the users in any list
- Results saved as data fields on each user
- New users checked in real time via webhook
- Auto-clean every 7, 14 or 30 days
Prefer CSV or the API? Both work too, see below.
What Iterable cleans for you
Iterable's native hygiene runs on bounce events and subscription state. Every non-delivery is logged as a bounce event on the user profile, and when an address hard-bounces Iterable automatically unsubscribes that user from the campaign's channel and every other marketing email channel in the project, so it stops mailing them after the first permanent failure - and it deliberately keeps these bounce-driven unsubscribes out of the unsubscribe numbers in Campaign Analytics and Messaging Insights, tracking them under bounces instead. Soft bounces are the deliberate exception: Iterable does not auto-unsubscribe a mailbox that only soft-bounces, so pruning a chronically soft-bouncing address is left to you - the documented practice is to build a segment of users who have repeatedly soft-bounced over a 60- to 90-day window and unsubscribe them yourself. On top of the automatic side, campaign-level suppression lists let you attach a saved list of addresses that a given send will skip, and because channels contain message types, unsubscribing someone from a whole channel silences every message type in it. For addresses Iterable has actually messaged and seen hard-fail, that's reliable, automatic hygiene.
What it can't catch
The catch is that every one of those mechanisms is reactive - it needs a send and a failure to fire, and the soft-bounce case needs you to go build the segment first. Iterable makes the blind spot sharper than most because it's event-driven: a user profile is created the moment an identify or track call arrives from your app, SDK, or an import, so a typo like jane@gmial.com, an address migrated from a previous tool, a disposable domain, a role address (info@, support@), or a mailbox that has quietly decayed has never bounced because Iterable has never sent to it. Those profiles look perfectly healthy until an event finally triggers their first message - which is exactly when a mailbox provider forms its first impression of your domain. And because journeys and campaigns are event-triggered, a dead address doesn't just fail once: it keeps re-entering flows whenever a matching event fires, so the same bad mailbox gets mailed again and again. An imported or SDK-fed audience is the sharpest case - it arrives with its bounce history stripped, so addresses that were already failing elsewhere look brand new.
Why a clean Iterable list matters
On Iterable the stakes are unusually concrete, because Iterable is an enterprise platform priced on the scale of your audience and your message volume - quote-based and sales-led, negotiated as a contract around your monthly active users (the unique people you actually contact) and how many messages you send. That makes a dead address expensive twice over. Directly: every never-messaged invalid you send to counts as an active user for that month and burns a message from your contracted volume - you are literally paying to deliver into a hard bounce. And structurally: a database bloated with undeliverable profiles inflates the audience size your renewal is negotiated around. The reputation cost is the same signal, sharpened - each bounce, spam trap, or complaint is exactly what Gmail and Yahoo's 2024 sender rules, and Iterable's own deliverability monitoring, judge your sending domain on, and on cross-channel sends that reputation decides whether the customers you earned honestly ever reach the inbox. Cleaning before the send does both jobs: it keeps junk off the count your contract is built on, and it protects the deliverability of the campaigns that actually convert.
Prefer CSV or the API? Here's the manual path
Iterable is an API- and data-pipeline-driven engagement platform. If you'd rather not connect it, or need to clean a segment rather than a list, the manual path is: export your audience - a static list or segment via Save As > Export As > CSV, or the Export API for large audiences - verify it in Qualisend, then suppress the failures by unsubscribing them from a channel, or delete them outright, in bulk.
Export your audience from Iterable
Under Audience > Segmentation, build or open a segment (or static list) of the users you want to clean and run the query so you can see the current members, then use Save As > Export As > CSV File, tick the email field (plus any userId you key on), and export. For large or repeatable exports, run the Export API instead (dataTypeName=user, CSV output) - it's job-based, returns a jobId you poll for the files, and Iterable processes up to four export jobs per organization at once, queuing the rest.
Verify the file in Qualisend
Upload the CSV to Qualisend bulk cleaning - up to 1,000,000 addresses per job, duplicates charged once - or paste a sample into the free checker first. The free plan's 100 one-time credits, which never expire, cover an initial spot-check before you commit.
Read the results
Every address returns deliverable, risky, undeliverable, or unknown with a reason code, a 0-100 score, and sub-flags (catch-all, disposable, role, full mailbox), plus the MX provider and probe detail as evidence. Download the cleaned CSV.
Suppress or delete the undeliverables in Iterable
Filter your results to undeliverable. The fastest bulk action in the UI is Audience > Lists > overflow menu > Manage Users > Unsubscribe from Channel, where you paste or upload the bad addresses and unsubscribe them from a channel - a channel unsubscribe stops every message type in that channel, not just one list. Via API you can call POST /api/lists/unsubscribe, or to actually remove a dead profile from your database and your billable count, delete it (DELETE /api/users/{email}) or forget it (POST /api/users/forget, which also blocks future re-collection). Suppression stops the mail; deletion is what takes the address off the marketable count.
Or automate it at signup
Prefer to keep junk out before it ever mints a profile? Verify at the point of capture with the Qualisend REST API (scoped keys, rate limits, webhooks) - call it before your app fires Iterable's identify or track, so a typo or disposable address never becomes a user in the first place - or wire a no-code flow through Zapier, Make, or n8n to check new signups before they reach Iterable. That's the highest-leverage option on an event-driven platform, because it stops the dead profile from ever being created, mailed, and billed.
What Qualisend flags on every address
- Never-messaged invalid addresses that would hard-bounce the first time an event triggers a send
- Disposable / throwaway domains built to expire, captured through your SDK or an import
- Role addresses (info@, support@) that skew the engagement data your Iterable segments and journeys run on
- Catch-all domains, flagged so you can route them to a dedicated segment and throttle instead of blasting
- A 0-100 confidence score and machine-readable reason code for every address, ready to write back as a user profile field
The native Iterable connector is live. Connect it in Qualisend under Integrations and work with your Iterable list directly, no CSV needed.
What to do with each result
Every address comes back with a verdict and sub-flags. Here's the action that keeps your Iterable list clean without throwing away contacts you can still reach.
deliverableKeep messaging as normal.deliverable + role flagKeep for transactional and system messages; exclude from engagement-judged journeys.risky + catch-all flagRoute to a dedicated segment and throttle - the domain accepts everything at the door, so the mailbox behind it can't be confirmed.risky + disposable flagUnsubscribe from the channel or delete - the inbox was built to expire.unknownKeep active and re-verify next clean - usually greylisting or rate-limiting, not a verdict on the mailbox.undeliverableUnsubscribe from the channel to stop the mail, or delete/forget to take it off your marketable count; don't wait for the bounce to prove it.Related reading
Verify at the identify/track call so junk never becomes an Iterable user.
Spot-check a sample of your Iterable audience before a full bulk clean.
How fast a dirty, event-driven list compounds into a deliverability problem.
What a wave of hard bounces does to your standing across every channel.
The 2024 bounce and complaint thresholds your Iterable sends are judged against.
Set a cadence so never-messaged profiles don't pile back up in your database.
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