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Connect Mails.so

1 auth method · updated 2026-09-10

Mails is an API service that provides powerful email validation capabilities to help maintain a clean and effective email list.

mails.so ↗

API key

Uses your own credential — Verslay stores it encrypted

Connectable today
  1. 1
    Sign in to Mails.so
    Open https://mails.so and sign in to the account you want to connect.
  2. 2
    Create the API key
    Generate a new API key from the API or developer settings in your Mails.so dashboard.
  3. 3
    Copy it immediately
    Mails.so 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 Mails.so, and paste the API key into the Mails 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

Mails API Key

Your Mails API key used for authenticating API requests.

required · secret
Mails.so website ↗

Connect Mails.so once — every agent can use it

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

Open the Hub →
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