Business Contacts Verification
A found contact is only worth sending to if it works. This guide covers the two verification tools: the WhatsApp Checker (is the number active on WhatsApp?) and the Email Verify Checker (will the email deliver?).
Need contacts first? → Find Business Contacts
WhatsApp Verification
Stop wasting messages on dead numbers. DataMint opens each number on WhatsApp Web in your own Chrome and checks whether it’s an Active WhatsApp account - so every message lands on a real, reachable contact.
How It Works
- Make sure you’re logged into WhatsApp Web (
web.whatsapp.com) in the same Chrome profile as the extension. - In the Data Table, pick the phone column and run the WhatsApp Checker preset.
- DataMint opens each number as a
wa.mechat, one at a time, and detects whether the account exists. - Each number is tagged Active or Not Active in the column.
No backend or API keys are required - the check runs entirely through your logged-in WhatsApp Web session.
Safety Delay
Because each check opens a real chat, DataMint paces itself:
- Delay slider: 0–60 seconds between checks, default 15s.
- “Risk” badge: settings of 5 seconds or below show a risk warning - fast checking mimics bot behavior and can get your WhatsApp account flagged.
- Checks always run one at a time (no parallel checking).
Recommendation: leave the delay at 15s or higher. Verifying 100 numbers at the default pace takes around 25 minutes - run it in a background tab and check back.
Phone Number Format
The checker works best with full international numbers (E.164, e.g. +8801712345678). If your numbers are missing country codes, use the Phone Number Finder or a custom AI column to normalize them first - see Find Business Contacts.
Email Verification (Reoon)
Extraction proves the email is published - not that it delivers. Cold outreach requires near-zero bounce rates to keep your sending domain out of spam folders, so verify with Reoon before you send.
Requirements: desktop app running + Reoon API key (Set Up Your API Keys) - no LLM key needed.
Two Verification Modes
| Mode | What it does | Speed | Timeout |
|---|---|---|---|
| Quick (default) | Syntax + disposable-domain checks | ~0.5s | 15s |
| Power | Full SMTP probe - connects to the mail server and checks the mailbox | slower | 70s |
Power mode also adds an overall deliverability score (NN%) and detailed logs. If Power times out on an address, DataMint suggests retrying with Quick.
Status Meanings
| Reoon status | Cell label | Meaning |
|---|---|---|
valid | ✅ Valid | Mailbox exists and accepts mail |
safe | ✅ Safe to send | Deliverable with normal risk |
invalid | ❌ Invalid | Mailbox/domain rejects mail - don’t send |
disabled | ❌ Disabled | Mailbox disabled |
inbox_full / disposable / catch_all / role_account | ⚠️ flagged | Send with caution |
spamtrap | 🚫 Spamtrap | Never send - spam trap address |
unknown | ❓ Unknown | Couldn’t determine |
What the checks cover: MX record lookup (domain receives mail), SMTP handshake (server accepts the recipient without actually sending), disposable-domain filtering (burner addresses), and catch-all detection (servers that accept any username - the riskiest category to trust).
Workflow
- Get emails into a column (scrape → find, import, paste).
- Run Email Verify Checker on that column - Run first 10 to confirm your key works.
- Export the CSV and filter on the status column before building your campaign.
Troubleshooting
| Problem | Solution |
|---|---|
| Every WhatsApp number shows an error | You’re logged out of WhatsApp Web - log in at web.whatsapp.com and retry |
| WhatsApp checks seem stuck | The safety delay is waiting between checks - check the slider value |
| WhatsApp results wrong for local numbers | Add country codes (E.164 format) before checking |
| Tab closed mid-run | Re-run with Retry skipped results to fill only the unchecked rows |
| Email verification “API key missing” | Add your Reoon key in AI Settings |
| Power mode times out | Retry those rows with Quick mode |
Related
- Find Business Contacts - where the contacts come from
- Manage Data Table - run controls & retry
- Cold Email Templates · WhatsApp Scripts