Mailgun Email Validation alternatives
Maybe a large import pushed you past Mailgun's bundled 5,000 validations and the per-hundred overage showed up on the invoice. Below: what standalone verification costs, and a checklist for lifting that step out of your delivery stack.
| Service | 100,000 addresses | Credits expire? | Bills unknowns? |
|---|---|---|---|
| ZapBounce | $139 | Never | No |
| ZeroBounce | Subscription only | Credits roll over while the subscription is active | Not stated |
| Bouncer | $400, and 1,000,000 for $2,000 | Never | No |
| Emailable | Custom | Never | No |
| Clearout | Not listed | Never | No |
| Kickbox | $500 ($1,100 for 250,000; $2,999 for a million) | Credits expire one year from purchase | No |
| Mailgun Email Validation | 5,000 included, then from $0.80 per 100 on Scale | Not stated on its pricing page | Not stated |
Read from each vendor's own pricing page in September 2026. Prices move, so confirm theirs before you buy. Ours are published in full on the pricing page.
Why people look elsewhere
Mailgun ties list hygiene to the account that delivers your mail. Agencies juggling several ESPs, or teams scrubbing an imported file before it touches any platform, pay for validation through a delivery subscription built for a different job. ZapBounce runs as an independent step: upload a spreadsheet or hit the endpoint, then route the survivors wherever you like.
Mailgun meters validation per hundred. Foundation and Scale each bundle 5,000; beyond that, Foundation runs from $1.20 per 100 and Scale from $0.80 per 100 (mailgun.com/pricing, read September 2026). ZapBounce quotes whole lists instead: $5 for 1,000, $25 for 10,000 and $139 for 100,000, with no delivery subscription sitting underneath.
What ZapBounce changes for a Mailgun Email Validation user
The differences that show up on the first invoice and the first results file.
The short version
- An independent verifier: $5 buys 1,000 checks, with no delivery subscription attached and no tie to one ESP.
- Six published tiers running up to $949 for 1,000,000 addresses, each priced per list.
- Unknown rows and repeated addresses in a file cost nothing, stated as a headline on our pricing page.
- Purchased credits carry no expiry date, and each month adds 100 free ones without a card.
- Our own handshake on port 25 quits before DATA, so recipients never receive anything.
Before you move off Mailgun Email Validation
Run the same sample through two vendors and the interesting number is not how many came back valid.
Audit last quarter's overage
Pull the validation overage from your three most recent Mailgun invoices and divide it by the addresses checked. Compare that per-address cost with $5 per 1,000.
Pick the entry point
A registration-form call rejects a dead mailbox before it ever costs a send. A bulk pass cleans the backlog. The ZapBounce API covers the first, and spreadsheet upload covers the second.
Set an accept-all policy
Accept-all rows carry a domain answer rather than a mailbox answer. Settle now whether they ride along in the Mailgun campaign, go to a slower drip, or get dropped.
Trial one sample through both
Run an identical few-thousand-address sample through Mailgun validation and through ZapBounce, then count the rows lacking a definite verdict. That ratio says more than any headline.
What switching actually involves
Your Mailgun domains, routes, templates and webhooks keep running untouched. Point your registration handler at POST /v1/verify with a Bearer key, or drop older spreadsheets into the dashboard as CSV, TXT or XLSX. Rows return valid, invalid, catch_all or unknown plus a reason code, and only the keepers get imported into Mailgun.
What stays true whichever verifier replaces Mailgun Email Validation
Questions about moving off Mailgun Email Validation
What does independent verification cost next to Mailgun overage?
ZapBounce lists $5 for 1,000, $25 for 10,000 and $139 for 100,000, paid once. Credits never expire, and unknowns and duplicates are free.
Does leaving Mailgun validation change my delivery setup?
Delivery stays in Mailgun. ZapBounce only decides which addresses get imported, with one Bearer key and one POST per address, or one file upload per list.
Does Mailgun's suppression list do the same job as verification?
They work at different moments. Mailgun adds an address to its bounce suppression list after a message fails, so the hit to your sending domain has already landed. ZapBounce checks the mailbox before the first message, through an SMTP conversation that closes before DATA. Pair the two: verify on entry, and let suppression catch anything that dies later.
How do I run a Mailgun mailing list through ZapBounce?
Pull the members of the mailing list through Mailgun's lists API into a CSV. Upload that file, download the results with your original columns intact, and re-add only the valid rows. Keep catch_all rows on a separate list for a smaller, slower send.
Why do people leave Mailgun Email Validation?
Mailgun ties list hygiene to the account that delivers your mail. Agencies juggling several ESPs, or teams scrubbing an imported file before it touches any platform, pay for validation through a delivery subscription built for a different job. ZapBounce runs as an independent step: upload a spreadsheet or hit the endpoint, then route the survivors wherever you like.
How hard is it to switch verifiers?
For bulk cleaning, no harder than uploading the file somewhere else. For real-time checks on a signup form it is an API swap, which is an afternoon.
Leave delivery with Mailgun, move hygiene upstream, and quote your next import at $139 for 100,000, on credits with no expiry date.
Put us next to Mailgun Email Validation on your own list
100 free checks a month, no card.