Mailfloss alternative
Mailfloss costs $29 a month, metered as monthly plans by volume. SimpleVerifier is $29.99 a month with no cap on verifications, the email finder or enrichment. Both run real SMTP mailbox checks. Keep Mailfloss if you want verification that runs automatically against your email platform's list rather than as uploads you remember to do.
Prices read from mailfloss.com · last checked 2026-10-12
| Mailfloss | SimpleVerifier | |
|---|---|---|
| Cheapest route | $29/mo | $29.99/mo |
| Per year | $348 | $359.88 |
| Verification limit | Monthly plans by volume | Unlimited |
| Real SMTP mailbox check | ||
| Re-verifying a list costs again | cached 14 days | |
| Email finder included | Varies by plan | Yes, unlimited |
What it actually costs, by list size
One pass over a list, on Mailfloss’s cheapest available route versus one month of SimpleVerifier. Where Mailfloss sells both a subscription and pay-as-you-go, the cheaper of the two is used.
| List size | Mailfloss | SimpleVerifier | Cheaper |
|---|---|---|---|
| 1,000 | Not publishedAllowance not published | $29.99 | Unknown |
| 10,000 | Not publishedAllowance not published | $29.99 | Unknown |
| 50,000 | Not publishedAllowance not published | $29.99 | Unknown |
| 100,000 | Not publishedAllowance not published | $29.99 | Unknown |
One pass only. Every figure in the Mailfloss column recurs each time you re-verify; the SimpleVerifier column does not, because confirmed results are cached for 14 days and volume does not change the price. Adjust for your own pattern in the cost calculator.
Where Mailfloss’s pricing bites
Mailfloss charges $29 a month, and the plan is sized by monthly volume, so a list that grows pushes you up a tier whether or not the extra addresses are worth checking. That is not a criticism of the product — it is how per-address pricing works, and it is fine when your volume is small and steady. It stops being fine the month you acquire a list, inherit a CRM export, or want to re-check something you verified in the spring.
The reason we can price flat is narrow and worth stating plainly: a mailbox check is a DNS lookup plus a short SMTP conversation, and it costs us nothing per address. Metering it would be a pricing choice, not a cost recovery. The one feature with a genuine per-record cost — lead sourcing — does carry a published fair-use limit of 10,000 a month.
Who should stay with Mailfloss
Keep Mailfloss if you want verification that runs automatically against your email platform's list rather than as uploads you remember to do. A dedicated verifier replaces one part of that, not the whole thing, and switching to shave a few dollars a month while losing a workflow you depend on is a bad trade.
Test both before you decide
Do not take either vendor’s word on accuracy. Invent an address at a real domain and verify it on both. A tool doing real mailbox checks returns invalid; one checking only syntax and MX returns valid. Run the same test on any tool you are considering, ours included.
Common questions
- How much does Mailfloss cost?
- Mailfloss costs $29 a month, metered as: monthly plans by volume. Prices read from mailfloss.com on 2026-10-12.
- Is there a cheaper alternative to Mailfloss?
- SimpleVerifier is $29.99 a month with no limit on verifications, against $29 a month for Mailfloss. Which is actually cheaper depends on your volume and how often you re-verify — the plan is sized by monthly volume, so a list that grows pushes you up a tier whether or not the extra addresses are worth checking. Keep Mailfloss if you want verification that runs automatically against your email platform's list rather than as uploads you remember to do.
- Should I switch from Mailfloss?
- Keep Mailfloss if you want verification that runs automatically against your email platform's list rather than as uploads you remember to do. Switch if your verification volume is spiky or large and you would rather pay one flat price than manage an allowance.
- Does SimpleVerifier do real SMTP mailbox checks like Mailfloss?
- Yes. Every address gets a syntax check, an MX lookup and an SMTP conversation with the recipient's mail server to confirm the specific mailbox. Anything the probe cannot confirm is returned as risky rather than valid, and 8,740 disposable domains are blocked outright.
Try it against your own list
$29.99 a month, unlimited verifications and API access, cancel anytime.