How It Works

Three steps.
Zero bounces.

InboxCheck lives exactly where you work - inside LinkedIn, Apollo, Gmail, and any page with an email on it. Install once, verify forever.

Process

How it works
step by step

From installation to your first verified email in under 30 seconds. No accounts, no API keys, no configuration.

inboxcheck
1// 1. Click "Add to Chrome"
2// 2. Pin the extension
3// 3. Start browsing
4
5// That's it. No signup needed.
6// 15 free verifications/day
Ready
Capabilities

Everything you need.
Nothing you don't.

Four core capabilities that turn email verification from a chore into a reflex. Each one designed for how SDRs actually work.

01

Hover to Verify

Move your cursor near any email on any webpage. A small verify badge appears right next to it. One click - instant results without leaving the page.

Works on LinkedIn profiles, Apollo prospect lists, Gmail compose windows, HubSpot CRM records, and literally any webpage that displays an email address.

crm.example.comsarah.chen@acme.coVerify
02

Instant Verdicts

Get a clear Safe, Risky, or Unsafe verdict in under a second. See the reason why, whether it's a role-based address, free provider, or dead mailbox.

Every verdict comes with context. We don't just say 'invalid' - we tell you the mailbox doesn't exist, or the domain is a known spam trap, or it's a catch-all that might silently discard your email.

sarah.chen@acme.co📋×✅ Safe to SendMailbox exists and is accepting mail.ℹ Free email (Gmail, Yahoo, etc.)23/25 remaining today▸ Details🔕 Pause on crm.example.com
03

Works Where You Work

LinkedIn, Apollo, HubSpot, Gmail - any page with an email on it. Once verified, a color-coded dot stays inline so you can scan an entire list at a glance.

The persistent markers mean you never have to re-verify or remember which emails you already checked. Green, amber, red - visible instantly as you scroll through prospect lists.

apollo.io/contactsNAMEEMAILSarah Chensarah@acme.coMike Torresinfo@newstartup.ioLi Weili@tmpmail.xyzPriya Sharmapriya@bigcorp.comSafe to email
04

Domain Intelligence

One click opens a deep enrichment panel. SPF and DMARC records, domain age, blocklist status - everything you need to trust the sender's domain.

Go beyond simple valid/invalid. Understand the domain's email infrastructure before you send. A 12-year-old domain with proper SPF and DMARC is a very different signal than a 3-month-old domain with no records.

sarah.chen@acme.co×✅ Safe to Send▾ DetailsSPF✓ PresentDMARC✓ rejectDomain age12 years(2014-03-15)Blocklist✓ CleanConfidence:96/100
Ready?

See it in action.
30 seconds.

Install the extension, open any page with an email address, and verify. That's the entire onboarding.

15 free verifications/day · No credit card required