Is MailboxValidator API down?
Current status, daily uptime history and troubleshooting for the MailboxValidator API (Email).
No, MailboxValidator is up
MailboxValidator answered our last daily check (Oct 24, 2026, 12:25 UTC) in 782 ms with HTTP 200.
Checking MailboxValidator now…
Sending a request from our server.
MailboxValidator API uptime history
- Uptime
- 2 checks so far
- Last check
- Oct 24, 2026, 12:25 UTC
- Response
- 782 ms · HTTP 200
- Last up
- Now
We check MailboxValidator's listed URL (https://www.mailboxvalidator.com/api-email-free) once a day. History started when MailboxValidator was first checked, so new entries show fewer than 30 days.
MailboxValidator API not working for you?
- MailboxValidator needs an API key. A 401 or 403 usually means a missing, expired or mis-sent credential: check whether it belongs in a header or the query string.
- A 429 response means you're being rate-limited. Slow down, cache responses, and respect any Retry-After header.
- If calls fail only in the browser with a CORS error, MailboxValidator may not allow cross-origin requests. Call it from your server instead.
- If it works from one network but not another, check firewalls, VPNs and regional blocks.
- Check the provider's documentation, status page or social accounts for planned maintenance or a changed endpoint.
Email APIs up at their last check
- 1
Kickbox API
Online · 1026 msEmail verification API. A free email API by Powered by Kickbox.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS - 2
mail.gw API
Online · 546 msAPI for creating temporary email accounts.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS - 3
mail.tm API
Online · 454 msTemporary Email Service. A free email API by Mail.tm.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS - 4
MailSenpai DNS Check API
Online · 805 msCheck a domain's SPF, DKIM, DMARC and MX records and get what to fix, with the values to publish.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS - 5
Email Validator by LifeStep API
Online · 1178 msValidate email syntax and MX, detect disposable/role addresses, suggest typo fixes.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
Compare all MailboxValidator alternatives · APIs down right now
MailboxValidator API status FAQ
Is MailboxValidator API down right now?
MailboxValidator answered our last daily check (Oct 24, 2026, 12:25 UTC) in 782 ms with HTTP 200. This page also runs a live check from our server when you open it, so you can see whether MailboxValidator is responding at this moment.
How do you check whether MailboxValidator API is up?
Once a day our checker requests MailboxValidator's listed URL (https://www.mailboxvalidator.com/api-email-free) and records whether it answers within 15 seconds. Answers like 401 (needs a key), 403 (blocks bots) or 429 (rate-limited) count as up, because the server responded. The listed URL is often the documentation page, so an API endpoint can occasionally fail while its docs stay up.
What can I use if MailboxValidator API is down?
Free Email APIs that were up at their last check include Kickbox, mail.gw, mail.tm. See the full list of MailboxValidator alternatives for a comparison.
Why does MailboxValidator API work for others but not for me?
MailboxValidator needs an API key. A 401 or 403 usually means a missing, expired or mis-sent credential: check whether it belongs in a header or the query string. A 429 response means you're being rate-limited. Slow down, cache responses, and respect any Retry-After header. If calls fail only in the browser with a CORS error, MailboxValidator may not allow cross-origin requests. Call it from your server instead.