If you run client campaigns out of GoHighLevel, every list a client hands you is a deliverability risk you inherit. This guide covers why bounces hurt agencies more than most senders - reputation, broken automations, restricted sending - and the exact CSV round trip to verify GHL contacts with BounceZero: export, bulk-verify, reimport. Pay-as-you-go per client, no subscription floor.
GoHighLevel puts every client in its own sub-account, but the deliverability consequences of a dirty list don’t stay neatly inside one sub-account. Whether you send through LC Email or your own SMTP integration, email providers enforce bounce-rate thresholds - and an agency blasting an unverified client import is exactly how those thresholds get tripped.
High bounce rates on a single client’s campaign damage the reputation of the domain doing the sending - and sustained bounces can get sending restricted or paused mid-campaign, on a client you bill. Cleaning lists before the first send is far cheaper than explaining a paused campaign afterwards.
GHL workflows assume the email arrived. A nurture sequence firing into dead mailboxes never generates opens or replies, contacts stall at step one forever, and your reporting to the client shows engagement rates dragged down by addresses that were never reachable in the first place.
Clients hand you exports from old CRMs, scraped lead lists, and spreadsheets nobody has touched in two years. Verifying at onboarding - before anything is loaded into a campaign - means the deliverability problems in that data become a line item you fixed, not a fire you inherited.
There’s no plugin to install and nothing to connect. The whole process is a CSV round trip that works on any GoHighLevel plan, per sub-account, in three steps.
In the client’s sub-account, open Contacts, select the contacts or smart list you want to clean, and export to CSV. Export one sub-account at a time so results stay per-client - that keeps billing and reimporting clean too.
Upload the CSV to BounceZero’s bulk verifier. Every address runs through the 5-stage pipeline - syntax, domain and MX checks, mailbox-level SMTP verification, and catch-all detection with a confidence score. Download the results as CSV when the job finishes.
Reimport the valid contacts into the same sub-account, mapping the email column as usual. Apply a tag during import (for example verified-2026-07) so your workflows and smart lists can filter on verified contacts - and tag or remove the invalid ones so no automation ever emails them.
| Result | What it means | What to do in GoHighLevel |
|---|---|---|
| Valid | The mailbox exists and accepts mail - confirmed with real evidence, not a guess | Keep. Safe for campaigns and workflows. |
| Invalid | The mailbox doesn’t exist or rejects mail | Remove, or tag do-not-email so no automation touches it. |
| Catch-all | The domain accepts everything; BounceZero attaches a confidence score | Send to high-confidence addresses; suppress or drip-test the rest. |
| Unknown | The server gave no reliable signal either way | Don’t guess. Exclude from sends and re-verify later. |
One honest note on catch-all domains: no verifier on the market can guarantee a mailbox behind a catch-all server, because the server accepts everything by design. BounceZero’s confidence scoring tells you how likely each catch-all address is to be real instead of pretending certainty it doesn’t have - useful when a client’s B2B list is heavy on company domains.
There’s no subscription and no monthly minimum. Each cleanup is a one-off pack purchase sized to that client’s list - a clean line item you can rebill or absorb, instead of a platform fee you pay in months when no client needs a cleanup.
Leftover credits from one client’s job roll straight into the next client’s. Buy a bigger pack for the better per-email rate, and draw it down across your whole book of clients at whatever pace onboarding actually happens.
Every account gets 100 free verifications per month - enough to spot-check a sample of a new client’s list, or verify the trickle of new leads a small client generates, before spending anything.
You’re processing your clients’ contact data, which makes your verifier part of your own GDPR story. BounceZero is EU-based with EU data residency - a straightforward answer when a client’s DPA questionnaire asks where their contacts’ emails were processed.
Real pack prices - no subscription, no minimum, credits never expire. A typical local-business client with 2,000 contacts is $6; a 10,000-contact database is $30.
| Pack | Credits | Price | Per email |
|---|---|---|---|
| Starter | 2,000 | $6 | $0.0030 |
| Growth | 5,000 | $15 | $0.0030 |
| Professional | 10,000 | $30 | $0.0030 |
| Business | 50,000 | $140 | $0.0028 |
| Scale | 100,000 | $280 | $0.0028 |
| Pro Scale | 250,000 | $650 | $0.0026 |
| Enterprise | 500,000 | $1,200 | $0.0024 |
| Ultimate | 1,000,000 | $2,200 | $0.0022 |
Honest answer: there’s no native GoHighLevel app today. The CSV round trip above is the workflow, and for periodic cleanups - the way most agencies actually verify - it takes a few minutes per client and works on any GHL plan with no extra tooling or per-seat costs.
If you want verification inside an automated flow, BounceZero has a REST API: single-address and bulk endpoints you can call from your own scripts or automation stack, so new leads can be verified as they come in rather than in batches. If you’re building that, the API documentation covers both endpoints.
New to verification? Start with the complete email verification guide.
Inside the sub-account whose list you want to clean, open Contacts, select the contacts or smart list you want, and use the export action to download a CSV. If you don’t see an export option, your agency admin may need to enable that permission for your user role.
There’s no native GoHighLevel app today. The workflow is a CSV round trip - export contacts from GHL, bulk-verify them in BounceZero, and reimport the clean list - which works on any GHL plan with no extra tooling. If you want to automate it, BounceZero also has a REST API you can call from your own scripts or automation stack.
BounceZero packs start at $6 for 2,000 verifications. A 5,000-contact client list costs $15, a 10,000-contact list costs $30, and a 50,000-contact list costs $140. There’s no subscription and no monthly minimum, so each cleanup is a one-off cost you can pass through to the client - and unused credits never expire, so leftovers roll over to the next client.
Verify every list a client hands you before the first send, then re-verify periodically - every three to six months is a reasonable rhythm, and always before a major campaign. Email addresses go stale as people change jobs and abandon mailboxes, so a list that was clean at onboarding degrades over time.
Not instantly. Verification stops the damage by cutting bounces out of future sends, but sender reputation recovers gradually as mailbox providers see consistent low-bounce, well-engaged sending. Clean the list first, then rebuild with steady volume to your most engaged contacts.
Export the CSV from GoHighLevel, upload it to BounceZero, reimport the clean list. Packs start at $6 for 2,000 verifications - no subscription, no minimum, credits never expire, and every account gets 100 free verifications per month. No card required to start.
Ayoub built BounceZero's 5-stage validation pipeline, its dedicated BGP-announced IP infrastructure, and the Patroni HA PostgreSQL cluster behind every verification. Previously built high-volume email delivery infrastructure. Trained at 1337 Benguerir (École 42 network, 2019). Open-source: bgp_analyzer.