Keep your Squarespace customer list clean and deliverable
Squarespace Email Campaigns handles the reactive side of hygiene: it drops hard-bounced addresses from future sends and honors unsubscribes automatically. What it can't do is catch a bad address before the first campaign hits it, so a typo at checkout still costs you one bounce. Qualisend closes that gap with a live native Squarespace connector that verifies your customers in place, plus a REST API for checking every new address at the point of capture.
Connect Squarespace and clean it in place
Connect Squarespace and Qualisend verifies your customer emails in place — no export. Clean the customers you already have, tag the risky ones, and check every new customer in real time so order confirmations and receipts actually land.
Prefer to work by hand, or verify at signup through your own stack? The CSV export → verify → reimport loop below and the REST API are fully supported too.
Connect SquarespaceWhat Squarespace cleans for you
Squarespace Email Campaigns manages bounces and complaints after a send: addresses that hard-bounce are flagged and excluded from future campaigns, unsubscribes take effect immediately, and spam complaints suppress the contact. In the Contacts panel you can tag customers, group them into lists, and delete anyone by hand. Subscribers carry a simple status model of subscribed, unsubscribed, or pending confirmation. All of that protection is send-triggered, so it only reacts once a campaign has already gone out.
What it can't catch
Because the built-in suppression needs a real send and a returned bounce to fire, Squarespace has no way to judge an address before you mail it. It can't spot a never-mailed invalid from a CSV import or newsletter signup, a disposable throwaway domain, a role inbox like info@ or support@, a mailbox that has gone dead since the customer bought, or a catch-all domain that accepts everything and reveals nothing. Imported contacts are the sharpest edge: a CSV brings no bounce history with it, so Squarespace treats every imported address as fresh and clean. The first campaign to that list is the one that discovers the dead addresses, and by then the damage to your reputation is done.
Why a clean Squarespace list matters
Squarespace Email Campaigns bills on the number of emails you send each month, so every campaign fired at a fake or mistyped checkout address burns paid send volume for nothing. Worse, your order confirmations, receipts, and shipping notices ride the same sender reputation as your marketing, so a spike of hard bounces drags all of it down. Gmail and Yahoo's 2024 bulk-sender rules push this further, requiring you to keep spam complaints under 0.3% and bounce rates low or risk throttling and blocking. Cleaning the list up front keeps the transactional mail your store depends on landing in the inbox.
Prefer CSV or the API? Here's the manual path
The native connector is the fastest route, but the CSV loop works on any Squarespace plan: export from Squarespace, verify in Qualisend, and act on the results.
Export your customers from Squarespace
Open the Home Menu, go to Contacts, filter to the list or segment you want, then click Export to download the CSV. You can also pull a subscriber list from Email Campaigns under Mailing Lists.
Verify the file in Qualisend
Upload the CSV to a bulk cleaning job, up to 1,000,000 addresses at once, with duplicates charged only once and live progress as it runs. The free plan includes 100 credits that never expire, enough to sample your list first.
Read the results
Every address comes back as deliverable, risky, undeliverable, or unknown, with sub-flags for catch-all, disposable, role, and full mailbox, plus the MX provider, SMTP probe evidence, a reason code, and a 0 to 100 confidence score. Download the cleaned CSV.
Act in Squarespace
Back in Contacts, bulk-select the bad addresses and Delete the undeliverable ones, Add Tag to mark the risky ones, or Add to List to segment catch-alls into a throttled group. Undeliverables and disposables should come off before your next campaign.
Or automate it at signup
Connect Qualisend's native Squarespace connector for real-time verification of every new customer, or wire the REST API to your checkout and newsletter flows. A Zapier, Make, or n8n flow triggered on a Squarespace new order or new form submission lets you verify each address before it ever settles into Contacts.
What Qualisend flags on every address
- Never-mailed invalids from CSV imports and newsletter signups that would hard-bounce on your very next Squarespace campaign
- Disposable and throwaway domains that customers use at checkout to grab a discount and never check again
- Role addresses like info@, support@, and sales@ that inflate your list but rarely convert or engage
- Catch-all domains that accept every address at the server, flagged so you can segment or throttle them instead of trusting them blindly
- A 0 to 100 confidence score and a machine-readable reason code on every address, backed by SMTP probe evidence, so each keep-or-cut call is defensible
The native Squarespace connector is live — connect it in Qualisend under Integrations and clean your list without a single CSV. New contacts are verified automatically, and you can re-verify on a schedule.
What to do with each result
Every address comes back with a verdict and sub-flags. Here's the action that keeps your Squarespace list clean without throwing away contacts you can still reach.
deliverableKeep the contact subscribed and send to it normally.deliverable + role flagKeep it but Add Tag "role" in Contacts; the address works but expect low engagement from a shared inbox.risky + catch-all flagAdd to List as a catch-all segment and throttle sends; re-verify it at the next scheduled clean.risky + disposable flagAdd Tag "disposable" and unsubscribe or exclude it from campaigns.unknownSkip it on this send and keep it for the next re-clean; don't delete on a single inconclusive check.undeliverableDelete the contact or unsubscribe it so no future Squarespace campaign ever reaches it.Related reading
Set up the SPF, DKIM, and DMARC records Gmail and Yahoo now require before your Squarespace campaigns are trusted.
Why store customer lists decay fast and how verifying at checkout protects orders, receipts, and reputation.
How a spike of hard bounces from fake checkout emails throttles every message your store sends.
The 2024 bulk-sender thresholds for complaints, bounces, and authentication that your Squarespace mail must meet.
Scoped keys, rate limits, and webhooks to verify every new Squarespace customer at the point of capture.
Squarespace verification FAQ
Clean your Squarespace list in minutes
Start free with 100 credits that never expire — no card required. Connect, verify, and protect your next campaign.