ZapBounce vs MailboxValidator
MailboxValidator prints two things almost nobody else in this category prints: a turnaround commitment for every tier, and a plain statement that they do not support Yahoo validation. Then they put a 30-day expiry on every credit pack, which is the harshest term we found anywhere, and the comparison turns on that clause.
| ZapBounce | MailboxValidator | |
|---|---|---|
| Accuracy figure published | Coverage and accuracy together, once measured | None published |
| 1,000 addresses | $5 | $19.95 for 1,000 |
| 10,000 addresses | $25 | $59.95 |
| 100,000 addresses | $139 | $199.95 |
| Free tier | 100 a month, no card | 100 queries on a trial pack |
| Credit expiry | Never | 30-day validity printed on every tier, including paid packs |
| Billed for unknowns | No | Not stated |
MailboxValidator blocked automated checks or does not publish current pricing. Treat their figures here as indicative and confirm on their site.
How MailboxValidator prices it
Bulk packs from $19.95 for a thousand to $699.95 for a million, with per-tier turnaround times printed beside them, plus a separate monthly API ladder. The 30-day validity on every tier is the term that matters, because a price is only a price if you can still spend the credits.
Where MailboxValidator is the better choice
Stated plainly, because a comparison page that never concedes anything is not worth reading.
- They publish turnaround commitments per tier: under four hours at ten thousand, under twenty-four at a hundred thousand, under seventy-two at a million. Almost nobody in this category publishes an SLA at all.
- They state on their own pricing page that they do not support Yahoo validation. A vendor printing a capability gap where a buyer will see it is doing something the rest of this market avoids.
- Separate domain, disposable and role-validation products for teams that want those checks on their own.
Where we differ
What ZapBounce does differently
- Their credits carry a 30-day validity on every tier. Ours never expire.
- We verify Yahoo-hosted addresses and report them honestly as unresolvable where the server refuses to distinguish, rather than declining the domain.
- We never bill for unknowns.
What you give up leaving MailboxValidator
- They publish turnaround commitments per tier: under four hours at ten thousand, under twenty-four at a hundred thousand, under seventy-two at a million. Almost nobody in this category publishes an SLA at all.
- They state on their own pricing page that they do not support Yahoo validation. A vendor printing a capability gap where a buyer will see it is doing something the rest of this market avoids.
- Separate domain, disposable and role-validation products for teams that want those checks on their own.
Moving off MailboxValidator
The 30-day validity, more than anything. It is the harshest expiry we found anywhere in this category, and it applies to paid bulk packs rather than only to a trial. Buy a hundred thousand credits for a project that slips a month and they are gone.
Ordinary bulk work, with one wrinkle: their brand appears to be folding into Mailfloss. Confirm who you are actually contracting with before you renew anything, because a migration you did not plan may be happening to you regardless.
What MailboxValidator cannot do either
Questions people ask about MailboxValidator
Credits expiring in thirty days. Is that right?
It is printed on every tier, including paid bulk packs, and it is the harshest term we found anywhere in this category. Work out whether your project could slip a month before you buy a large pack.
They will not do Yahoo at all. Should that worry us?
It should inform you. Yahoo servers accept every recipient on purpose, so those addresses are hard for everyone. Declining them is honest. Attempting them and labeling the result unresolvable, which is what we do, gives you a count of how many you have.
What is happening with Mailfloss?
Their pricing path renders Mailfloss content in a browser and their homepage pricing links point there, while their own server still returns their bulk table. Something is mid-change. Confirm the contracting entity before you commit to either.
Is ZapBounce cheaper than MailboxValidator?
We cannot compare reliably, because MailboxValidator does not publish current pricing where we could read it. Ours is $5 for 1,000 and $139 for 100,000.
Can I test both before deciding?
Yes, and you should. Run the same sample of a few thousand addresses through each and compare how many came back unresolved. That difference matters more than either accuracy claim.
Check the expiry date on any credits you already hold. Thirty days is short enough that this comparison may be moot before you finish reading it.
Run the same sample through us and MailboxValidator
100 free checks a month, no card, and the unknowns come back labeled.