Use cases
Each page here is one job with a trigger and an end: the order the work happens in, what to do with every result, and the point at which you are finished.
These are deliberately not descriptions of who you are. Whether you run an agency or a shop, the job of cleaning a file before it lands on a new platform is the same job, and the mistakes people make doing it are the same mistakes. For pages organized by who you are, the solutions section does that instead.
Every page says what the work will not fix. Catch-all domains stay unresolvable by anyone, pristine spam traps stay undetectable, and a clean list does nothing for a broken authentication record. Work out which one you have. That decides whether any of this helps, and diagnosing a delivery failure is where that starts.
Block Disposable Email Addresses
ZapBounce flags disposable domains from an open-source list plus its own additions, refreshed weekly. Block them where free trials or coupons get abused.
Bulk Email List Cleaning
A large import is the moment to clean, because a CSV is easy to fix and a live database is not. The order of operations that keeps the bill down.
Catch-All Email Handling
Catch-all domains accept every address, about 28% of a B2B list. ZapBounce labels them catch_all; here's how to send to that segment safely.
Clean a List Before Migration
Moving to a new email platform starts your sending reputation from scratch. Clean the file before the import, not after the first campaign fails.
Cold Email Deliverability
Cold lists have no engagement history, so every bounce counts double. What to check before a sequence starts, and why catch-alls go out last.
CRM Data Quality
Bad CRM addresses waste rep time, skew pipeline reports and sync into every tool. Clean them without losing records, with 100 free checks a month.
Email Deliverability Recovery
When campaigns stop landing, check 4 causes in order: authentication, reputation, content, then the list. Fix the list with 100 free checks.
Email Duplicate Removal
Exact matching misses most duplicates. Gmail dots, plus tags and alias domains disguise one mailbox as several, and each one costs you twice.
Email Validation API for Signups
Verify signup emails from your backend: call POST /v1/verify in a background job, fail open on a timeout, and store the result. Unknowns are never billed.
International List Cleaning
Provider mix changes by country, and so does what a verifier can tell you. What shifts when your list is not mostly Gmail and Outlook.
List Hygiene as Standing Rules
The rules that keep an email list clean without anybody remembering to clean it: suppression on first failure, a sunset policy, and a scheduled check.
Monthly Email List Maintenance
A short recurring routine keeps a list healthy: read three numbers, act on the suppressions, and verify the segment about to be mailed cold.
Pre-Send Email Validation
A large campaign is the worst time to discover a data problem. The short list of things worth checking in the hour before a send.
Purchased List Audit
Before a bought list touches your sending domain, verify a 1,000-address sample for $5 and see what you really have before you mail any of it.
Re-engagement Campaign Prep
A win-back campaign mails the people most likely to have gone. Verify first, send to a sample, and decide with evidence whether the rest is worth the risk.
Reduce Your Email Bounce Rate
A bounce rate above 2% puts your sending account at risk. The steps that bring it down, in the order that works, starting with 100 free checks.
Role Account Filtering
Role addresses like info@ and sales@ reach a shared mailbox. Whether to remove them depends entirely on what you are sending and to whom.
Sender Reputation Repair
A damaged sending reputation recovers through weeks of small sends to people who engage. Cleaning the list is a precondition, not the cure.
Signup Form Email Protection
Check each address as it's typed: fix typos inline, stop throwaway domains, let unknowns through. 100 free checks a month, and unknowns are never billed.
Spam Trap Avoidance
Pristine spam traps are undetectable by any verifier. What actually lowers your exposure is where the addresses came from and how old they are.
Start with the file you have
100 free checks a month, no card, credits that never expire. Unknown results and duplicates are never billed.