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Each page covers what breaks in that specific platform when bounces climb, because the thresholds and the consequences differ sharply between them.

Amazon SES enforces a hard bounce-rate threshold with account review. Mailchimp suspends. Klaviyo scores deliverability its own way. Cold-email tools increasingly ship their own verification, which is worth understanding rather than dismissing.

ActiveCampaign email verification

ActiveCampaign automations fire on contact creation, so an unverified import can trigger thousands of sends at once. Verify before the contact exists.

Airtable email verification

Airtable automations run per record with a scripting step. Batch through a script rather than a per-record automation, and mind the API rate limit.

Amazon SES email verification

SES reviews an account at a 5% bounce rate and may pause sending at 10%. Verify a list before it reaches SES, from $5 for 1,000 checks.

Apollo email verification

Verify an Apollo export with a live SMTP check before you sequence it, by CSV, API or Zapier. 10,000 checks cost $25, and unknowns are never billed.

Attio email verification

Attach a ZapBounce verdict to Attio's email attribute rather than the record, the right shape for contacts with 2 or more addresses. See the setup.

AWeber email verification

AWeber reviews imported lists by hand before approving them for sending. Verify first so the review has nothing to object to, and the wait is shorter.

BigCommerce email verification

Verify BigCommerce customers and newsletter sign-ups by CSV, API or Zapier. 1,000 checks cost $5, and unknown results are never billed.

BigQuery email verification

Verify a BigQuery column without scanning the table repeatedly. Store the verdict with a timestamp, and only re-check what has aged or arrived.

Box email verification

Box is used where data governance is the point, so verification there should delete each job once its results are downloaded.

Braze email verification

Braze runs multichannel campaigns from one user profile, so an unusable email address should route a user to push or SMS rather than dropping them.

Brevo email verification

Brevo reviews accounts before the first send and watches bounce rates after. Verify an imported list before that review, with 100 free checks a month.

Bubble email verification

Bubble apps run signup flows where the API key must stay server-side. Use a backend workflow, never a client-side API call.

Calendly email verification

A mistyped address on a Calendly booking means no invitation and no reminder, so the meeting is a no-show nobody could have predicted.

Campaign Monitor email verification

Verify a Campaign Monitor list by CSV, API or Zapier and import the verdict as a custom field. 1,000 checks cost $5; unknowns are never billed.

Capsule CRM email verification

Capsule uses tags rather than heavy custom fields, so the verdict fits naturally as a tag set you filter campaigns on. Here is the tagging scheme.

Celigo email verification

Celigo integrations sync systems of record, so a verification verdict has to flow both ways or one system will overwrite the other's.

Clay email verification

Clay chains enrichment providers with waterfall logic. Put verification at the end of the waterfall so every candidate address gets one live check.

ClickFunnels email verification

ClickFunnels funnels chain pages, so a bad address captured at step one breaks every follow-up in the sequence. Verify at the opt-in.

Close CRM email verification

Close sends from connected mailboxes, so a bounce lands on a rep's own domain reputation. Verify before a sequence enrolls anyone.

Constant Contact email verification

Constant Contact bills on contact count. Verify before import so you stop paying for addresses that can't receive mail, from $5 per 1,000 checks.

ConvertKit email verification

ConvertKit bills on subscriber count and creators import lists from everywhere. Verify before the import so you stop paying for addresses that bounce.

Copper CRM email verification

Copper builds records from Gmail activity, so it captures every address a rep ever emailed, including the mistyped ones. Verify before those become a list.

Customer.io email verification

Customer.io bills by profile and triggers campaigns from events, so an unverified profile costs money and fires workflows from the moment it is created.

Drift email verification

Drift chatbots capture addresses mid-conversation, where people type quickly and mistype often. Verify in the bot flow and ask again.

Drip email verification

Drip workflows branch on subscriber data, so a verdict stored as a custom field turns unresolvable addresses into a routing decision rather than a bounce.

Dropbox email verification

Contact lists shared through Dropbox move between organizations, which makes provenance the first question and verification the second.

Dynamics 365 email verification

Dynamics 365 keeps email on 3 separate entities, and Microsoft-hosted domains resist probing. Verify contacts, leads and accounts the right way.

Eloqua email verification

Eloqua's contact washing machine already normalizes data in-flight, which is where a verification step belongs rather than as a separate batch job.

Firebase email verification

Verify in a Cloud Function, never in the client SDK, and keep the verdict out of documents the client can read if it belongs to someone else.

folk CRM email verification

folk imports contacts from LinkedIn and browser capture, where addresses are often inferred rather than given. Verify before those enter a sequence.

Freshsales email verification

Freshsales scores leads automatically and email activity feeds that score. Bad addresses produce silence that the model reads as disinterest.

Front email verification

Front routes shared inboxes across teams, so a bounce from one team's outreach degrades a domain every other team replies from.

GetResponse email verification

GetResponse holds imported lists for review and enforces bounce thresholds afterwards. Verify before the import so neither gate is a surprise.

GoHighLevel email verification

GoHighLevel agencies run many sub-accounts on shared sending infrastructure, so one client's dirty list damages every other client's delivery.

Google Ads email verification

Customer Match needs a minimum list size to serve, and unmatched addresses count against it. Verify before upload so the audience actually runs.

Google Drive email verification

Contact lists sit in Drive as spreadsheets and CSVs nobody owns. Verify from Apps Script and write results back without downloading the file.

Gorgias email verification

Gorgias links support tickets to Shopify orders, so a mistyped checkout address creates a customer support cannot match to their purchase.

Help Scout email verification

Help Scout sends replies from a shared mailbox, so bounces from bad customer addresses affect the domain your whole support team replies from.

HubSpot email verification

Add email verification to HubSpot forms and workflows by API, CSV or Zapier, before a bad contact is billed. 1,000 checks cost $5.

Insightly email verification

Insightly links contacts to projects and opportunities, so deleting a bad address breaks relationships. Store a verdict and suppress instead.

Instantly email verification

Verify an Instantly lead list before upload by CSV, API or Zapier. Four results with catch_all apart from unknown, 1,000 checks for $5, unknowns free.

Integrately email verification

Integrately's one-click automations hide the steps, so a verification call needs a webhook step you configure yourself. Here is where it belongs.

Intercom email verification

Intercom mixes support conversations and outbound campaigns on one contact, so a bad address breaks support replies as well as marketing.

Iterable email verification

Iterable keys users by email by default, so changing a bad address creates a new user and orphans the old one's history. Verify before the first write.

Justuno email verification

Justuno segments visitors before showing an offer, so the verdict can feed that segmentation as well as cleaning the list it collects.

Keap email verification

Keap gates email marketing behind a compliance review and marks addresses unconfirmed. Verify before import so the review and the opt-in both go smoothly.

Klaviyo email verification

Verify Klaviyo profiles before import or at signup by CSV, API or Zapier, so no typo gets suppressed. 1,000 checks cost $5; unknowns are free.

Leadpages email verification

Leadpages forms feed straight into an email platform, so a bad address lands on the list before anyone sees it. Verify in the webhook and tag the lead.

lemlist email verification

lemlist personalizes deeply, so every wasted send is wasted enrichment too. Verify before the list enters a campaign and keep the unconfirmable ones out.

LinkedIn Ads email verification

LinkedIn matched audiences work best on personal addresses, and B2B lists are full of corporate ones that resist both matching and verification.

Mailchimp email verification

Verify a Mailchimp audience by CSV, API or Zapier and write the result to a merge field. 1,000 checks cost $5, and unknowns are never billed.

MailerLite email verification

MailerLite approves every new account by hand and watches bounce rates after. Verify before import so the approval and the first send both go smoothly.

Mailgun email verification

Mailgun sells its own validation and enforces bounce suppression. Both matter, and the second one is why a pre-send check pays for itself.

Mailjet email verification

Verify a Mailjet contact list by CSV, API or Zapier, then exclude invalid contacts from campaigns. 1,000 checks cost $5; unknowns are free.

Mailshake email verification

Mailshake pauses campaigns automatically when bounce rates climb, so an unverified list stops a campaign mid-sequence. Verify before the first send.

Make email verification

Make charges per operation and its iterator multiplies them fast. Use an aggregator and the jobs endpoint rather than iterating one address at a time.

Marketo email verification

Marketo's database size drives the license cost and its smart campaigns trigger on data changes. Verify before records are created, not after.

Meta Ads email verification

Custom Audiences and lookalikes are built from matched users, so dead addresses weaken the seed the lookalike model learns from.

Missive email verification

Missive blends team inboxes with chat, and its mail merge sends from individual accounts. Verify before a merge to protect those accounts.

monday.com email verification

monday.com email columns check format only. Verify contacts through an integration recipe and write each of the 4 results to a status column.

MongoDB email verification

MongoDB's flexible schema means the same address can appear as a string, an array or a nested object. Normalize before verifying.

Moosend email verification

Moosend prices per subscriber and triggers automations on list joins. Verify before import so neither your bill nor 1 workflow sees a dead address.

MySQL email verification

MySQL's utf8 collation can silently truncate an address at an emoji or an accent. Check the column definition before blaming the verification.

n8n email verification

n8n can self-host and loop without per-task billing, which makes batch verification workflows practical. Here is the node layout that handles rate limits.

Notion email verification

Notion databases hold contact lists with no validation at all. Verify through the API on a schedule and write the verdict to a select property.

Nutshell email verification

Nutshell bundles email marketing with the CRM, so one bad list affects both sales sequences and campaigns. Verify once and gate both on the verdict.

Omnisend email verification

Omnisend runs email and SMS from one contact record, so a bad import costs twice. Verify before the contacts reach an automation workflow.

OneDrive email verification

OneDrive lists sit inside a Microsoft tenant, where verification probes against Microsoft-hosted recipients return unknown more often. Here is why.

OptinMonster email verification

Exit-intent popups capture addresses from people already leaving, which produces more throwaway entries. Verify before the subscriber is created.

Outreach email verification

Outreach reports sequence results at team level, so dead addresses skew how reps are judged. Verify prospects before loading them, 1,000 for $5.

Pabbly Connect email verification

Pabbly Connect prices by task with a one-time license option, which makes per-address verification viable where per-month tools make it costly.

Pardot email verification

Pardot syncs with Salesforce, so a verdict written in one appears in the other and can loop. Decide which system owns the field before you start.

Pipedrive email verification

Pipedrive persons can hold several email addresses at once, so a verdict per address matters more than a verdict per record. Here is how to store both.

PostgreSQL email verification

Store verdicts in their own Postgres table with a check timestamp and a partial index, so the query for stale rows stays fast as the table grows.

Postmark email verification

Postmark enforces transactional-only sending and watches bounce rates closely. Verify at signup so the account stays in good standing.

Power Automate email verification

Power Automate runs inside Microsoft 365, where probes are throttled. Expect more unknowns on internal addresses; ZapBounce bills 0 of them.

Privy email verification

Privy popups offer a discount for an address, which attracts throwaway entries. Verify before the code is issued and the subscriber created.

Redshift email verification

Redshift's UNLOAD and COPY through S3 is the natural path for verification: unload candidates, verify the file, copy results back.

Reply.io email verification

Reply.io runs multichannel sequences, so an unconfirmable address can route to a call or LinkedIn step instead of being dropped from the campaign.

Retool email verification

Retool apps are internal tools where staff type customer addresses by hand. Verify on blur and flag the typo rather than blocking the save.

Salesforce email verification

Salesforce keeps email on 2 objects, leads and contacts. Verify both, store the verdict on the record, and route on it with assignment rules.

Saleshandy email verification

Saleshandy throttles sending per mailbox to protect reputation. Verify first so that carefully rationed daily volume reaches addresses that exist.

Salesloft email verification

Salesloft cadences enforce step timing, so a bounce at step one means the prospect works through the whole cadence unreachable. Verify at import.

Segment email verification

Segment fans 1 identify call out to every tool, so a bad address lands everywhere at once. Verify in a Segment function before it fans out.

SendGrid email verification

SendGrid's suppression lists are permanent per address, so a bounce from a typo locks out a real customer. Verify before the first send.

Sendinblue email verification

Sendinblue is now Brevo, and older integrations still call the old API. Verify contacts before import, and check which API your automation uses.

Shopify email verification

A mistyped checkout address means no order confirmation and a support ticket. Suggest the correction on the page, and never block a paid order.

Smartlead email verification

Smartlead rotates across many mailboxes, which spreads bounce damage rather than removing it. Verify before upload and segment the unconfirmable addresses.

Snowflake email verification

Snowflake external functions can call the verify API from SQL, but the per-row model does not suit it. Use a staged batch instead.

SparkPost email verification

Verify addresses before SparkPost sends to them, by API, CSV or Zapier, and audit the suppression list. 1,000 checks cost $5; unknowns are free.

Streak email verification

Streak lives inside Gmail and sends from your own mailbox, so bounces hit your personal sending reputation. Verify before a mail merge goes out.

SugarCRM email verification

SugarCRM often runs on-premise behind a firewall, which changes how verification data moves. Here is the export-verify-import route that works either way.

Supabase email verification

Verify in a Supabase edge function so the key stays server-side, and keep verdicts in a table RLS protects from the client.

Tray.io email verification

Tray workflows handle high volume with real branching, so verification becomes a routing decision rather than a filter. Here is the branch layout.

Typeform email verification

Typeform validates email format and nothing more. Verify in the webhook and correct at the next question, which Typeform's one-question flow allows.

Unbounce email verification

Unbounce landing pages are paid traffic, so a bad address is a wasted click. Verify before the lead leaves the page and show the correction.

Verify emails in Google Sheets

Verify a column of emails in Google Sheets by CSV upload, Apps Script or Zapier, with a result beside every row. 1,000 checks cost $5; unknowns are free.

Webflow email verification

Webflow forms post to Webflow's own handler, so verification goes in a webhook after submission or a custom handler before it. Both work differently.

Woodpecker email verification

Woodpecker's own bounce shield stops sending to addresses that already failed. Verification is the step that happens before anything fails at all.

WordPress email verification

Block disposable and fake emails on WordPress and WooCommerce forms with a server-side ZapBounce check. Unknowns are free; 1,000 checks cost $5.

Workato email verification

Workato recipes run in enterprise environments with change control, so verification belongs in a reusable connector rather than pasted into each recipe.

Zapier email verification

Check each new lead in a Zap with a webhook step that calls ZapBounce, then filter on the result. One credit per check, $5 for 1,000.

Zendesk email verification

Zendesk creates a user from any incoming email, including mistyped reply-to addresses. Those users then receive ticket notifications that bounce.

Zoho CRM email verification

Zoho CRM enforces per-day email limits by edition, so every send to a dead address spends part of a hard quota. Verify before the campaign, not after.

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100 free checks a month, no card, and the unknowns come back labeled.

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