Mailsurity vs mailboxlayer
mailboxlayer (by APILayer) is a general email-validation API: syntax, MX, SMTP, catch-all, and a quality score, with disposable filtering as one field in the response. Mailsurity does one thing: catch disposable signups, including domains mailboxlayer has not added to its database.
Quick verdict
Choose mailboxlayer for general email validation
You want one API call returning syntax validity, MX/SMTP checks, catch-all detection, and a numeric quality score, with disposable filtering as part of that response.
Choose Mailsurity for disposable email detection
You specifically need to stop disposable/burner signups in real time, at the signup form, with brand-new throwaway domains caught before a static database catches up.
Pricing
mailboxlayer charges per request, tiered by monthly volume. Mailsurity is a monthly credit subscription with a free tier to start. Figures below are Mailsurity's live current prices, not estimates.
mailboxlayer
100 requests/month free, no time limit
$14.99/mo (5,000), $74.99/mo (50,000), $249.99/mo (250,000)
Mailsurity
500 free credits, no card required
$5/mo on Starter ≈ $1.00 per 1,000 checks*
Starter
$5 / month
5,000 checks / month
Growth
$19 / month
25,000 checks / month
Scale
$59 / month
100,000 checks / month
* Cost-per-1,000 assumes the full monthly credit allotment gets used. Unused Mailsurity credits don't roll over, so the effective rate is higher below full utilization.
Prices shown are Mailsurity's current live plans (see /pricing for the full breakdown, including annual billing); Mailsurity pricing verified September 2026. mailboxlayer figures are sourced directly from mailboxlayer.com/pricing and apilayer.com/products/mailboxlayer, verified September 2026 (mailboxlayer also offers a 10-15% discount on annual billing); confirm current rates on those sites before making a purchasing decision, as vendor pricing can change.
Feature comparison
Primary focus
mailboxlayer: General email-validation API (syntax/typo suggestions, MX, SMTP, catch-all, free-provider, and a 0.01-1.0 quality score) with disposable detection as one field in the response
Mailsurity: Disposable / temporary / burner email detection, specifically
Disposable-domain method
mailboxlayer: Cross-referenced against a database of disposable/free providers; the underlying method isn’t published
Mailsurity: 5 checks in order: your team's own allow/deny rules, a curated known-good list, a 220k+ domain disposable list, a saved verdict from a past check, then live analysis (with AI for unclear, brand-new domains)
Brand-new throwaway domains
mailboxlayer: Caught once added to mailboxlayer’s database
Mailsurity: MX-cluster reputation (tracking which mail servers throwaway-email providers tend to reuse) + AI gray-zone fallback (an AI check for domains the heuristics can't confidently call either way) can flag a domain before any static list has it
Free tier
mailboxlayer: 100 requests/month, no time limit (an ongoing free trial tier, not a one-time credit)
Mailsurity: 500 free credits, no card required
Entry paid tier
mailboxlayer: $14.99/mo for 5,000 requests (overage $0.01199/request beyond that)
Mailsurity: See plans below
Typical latency
mailboxlayer: Not published
Mailsurity: <100ms p99 on the real-time API
Bulk CSV list cleaning
mailboxlayer: Not the product’s stated focus; it is a single-lookup validation API
Mailsurity: Yes, enriched CSV back with classification, confidence, and source per row
The entire Mailsurity integration is one authenticated POST with plain fetch. No client library required.
curl -X POST https://mailsurity.com/api/check-email \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "user@mailinator.com"}'Example response:
{
"email": "user@mailinator.com",
"isDisposable": true,
"classification": "disposable",
"confidence": 0.94,
"reason": "high-entropy local part; MX cluster flagged disposable",
"source": "heuristic"
}Full request/response schema, error codes, and code samples in eight languages: see the API reference.
Why list-based disposable email detection misses new domains
Domain databases catch everything already added. The gap is timing: a new throwaway domain has to be discovered and added before it can be blocked.
Mailsurity layers MX-cluster reputation and an AI fallback for gray-zone domains on top of its own list. A domain can get caught on its first request, before it has ever been added to any list. See the full 5-layer detection cascade for how each layer works.
220k+ tracked domains
Sourced from public disposable-domain feeds and live throwaway-provider scraping, kept current as new ones appear.
99.4% accuracy
Measured on disposable/temporary email classification, the one thing Mailsurity is built to do.
FAQ
Is Mailsurity a good mailboxlayer alternative?
If you want one API call that returns syntax validity, MX, SMTP, catch-all, and a quality score, mailboxlayer covers that and Mailsurity does not replace it. If disposable detection specifically is the problem, including domains mailboxlayer’s database has not caught yet, that is what Mailsurity is built for, with a 500-credit free tier to try it first.
Is Mailsurity cheaper than mailboxlayer?
mailboxlayer’s free plan covers 100 requests/month; its entry paid tier is $14.99/mo for 5,000 requests, scaling to $74.99/mo (50,000) and $249.99/mo (250,000), verified on mailboxlayer.com/pricing. Mailsurity is a monthly subscription with a larger 500-credit free tier. See the live pricing above to compare at your volume.
Does mailboxlayer do more than disposable-email detection?
Yes. mailboxlayer is a general email-validation API: syntax and typo correction, MX/SMTP checks, catch-all detection, free-provider flagging, and a numeric quality score, with disposable filtering as one field in that response. Mailsurity only classifies disposable/temporary emails.
Can I use Mailsurity and mailboxlayer together?
Some teams run Mailsurity at signup time for real-time disposable blocking, and use mailboxlayer separately for the syntax/SMTP/catch-all checks it covers that Mailsurity does not. They are not mutually exclusive.
Will mailboxlayer’s disposable database catch the same domains Mailsurity does?
For domains already in that database, yes. The difference shows up on domains no database has yet. Mailsurity’s MX-cluster reputation and AI gray-zone fallback can flag those on the first request, where a static database waits for someone to add the domain.
How many disposable signups get through your forms
Paste your signup list into the free audit: no signup required, and the part before the @ never leaves your browser. Or start with 500 free API credits, no card required.