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Connect MailboxValidator

1 auth method · updated 2026-09-10

MailboxValidator checks email addresses for syntax, deliverability, mail-server availability, and free or disposable provider status.

www.mailboxvalidator.com ↗

API key

Uses your own credential — Verslay stores it encrypted

Connectable today
  1. 1
    Sign in to MailboxValidator
    Open https://www.mailboxvalidator.com and sign in to the account you want to connect.
  2. 2
    Create the API key
    Open https://www.mailboxvalidator.com/api-single-validation and generate a new API key.
  3. 3
    Copy it immediately
    MailboxValidator usually shows the full API key only once, right after you create it. Store it somewhere safe before closing the page.
  4. 4
    Connect in Verslay
    In the Verslay Hub, open Connections, find MailboxValidator, and paste the API key into the API Key field.
  5. 5
    Verify
    The connection flips to Connected. Run any read-only action once to confirm the credential has the right scopes.
  6. 6
    Rotate safely
    When you rotate later: connect the new credential first, confirm it works, then revoke the old one.

What you’ll paste into Verslay

API Key

Sign up for a MailboxValidator API plan, then sign in at https://www.mailboxvalidator.com/ and copy the API key from your dashboard. The key is sent as the required key query parameter; keep it secret. MailboxValidator has no identity endpo

required · secret
Get your credential ↗MailboxValidator website ↗

Connect MailboxValidator once — every agent can use it

Verslay agents share your connections. Connect MailboxValidator in the Hub and every use-case that needs it lights up — no per-agent setup.

Open the Hub →
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