Bulk Email Verifier

The Bulk Email Verifier helps you check the deliverability status of a large list of email addresses — saving you time and helping you avoid bounce rates.

Uploading a File

Tomba supports both .CSV and .TXT files with any delimiter.
To ensure smooth processing:

✅ Ensure all emails are in a single column
✅ Use a spreadsheet tool like Microsoft Excel, Google Sheets, or OpenOffice Calc
✅ Save/export the file as a CSV for optimal compatibility

How to Use Bulk Email Verifier

Go to the Bulk section of your account
Click on Email Verifier
Click + New Bulk and enter a name for your task
Upload your file
Wait while Tomba processes your list
Click Download to get the results in .CSV format

You can download:

All email addresses
Only valid emails

Creating a New Bulk Email Verification

When you click + New Bulk:

List Name

Give your task a unique name (3-201 characters).

List Content

Enter email addresses one per line in the text area, or upload a .CSV or .TXT file.

All emails must be in a single column
Maximum: 10,000 email addresses per bulk
File size must not exceed 4MB

CSV Column Mapping

For multi-column CSV files, a preview table shows the first 10 rows. Click on the column containing your email addresses to select it.

Options

Notify me when ready — Toggle to receive an email notification when complete

CSV Output Columns

Your downloaded CSV file will include these columns:

CSV Column	Description
`Email address`	The email address verified
`Status`	Verification result (Valid, Invalid, etc.)
`Regexp`	Email format validation result
`Gibberish`	Whether the email appears to be gibberish
`Disposable`	Whether the email uses a disposable provider
`Webmail`	Whether the email is from a webmail provider
`Mx records`	Whether the domain has valid MX records
`Smtp server`	Whether the SMTP server is responding
`Smtp check`	Whether the mailbox exists
`Accept all`	Whether the server accepts all emails
`Block`	Whether the email is blocked
`Score`	Confidence score (percentage)
`Phone` to `Phone10`	Up to 10 phone numbers (if phone enabled)

If you enabled Sources, the CSV will also include Total Sources and Source1 through Source10.

Email Verification Statuses Explained

Status	Meaning
✅ Valid	The email address is safe to use
⚠️ Accept all	The server accepts all emails, but mailbox setup can't be confirmed
❌ Invalid	The email will bounce — do not use
❓ Unknown	Verification couldn’t complete (server timeout, block, etc.)
✉️ Webmail	Address is from a webmail provider (e.g., Gmail, Yahoo); not verified
🕑 Disposable	Temporary email address; not safe to use

Viewing Task Results

Click on any task to view its detail page.

Progress Tracking

While processing: progress bar with percentage, live counter, browser tab favicon badge, and desktop notifications (bell icon).

Results Preview

A preview table shows the first rows with email addresses and their verification status. A pie chart visualizes the breakdown: Valid, Accept all, Invalid, Disposable, Unknown, and Webmail.

Download Options

Click Download to choose:

Full list — All email addresses with their status
Valid only — Only verified valid email addresses

Task Details

Details grid shows: Created and Expiration dates, Processing duration, Total emails verified, Verification cost in credits.

Task Actions

From the dropdown menu: Rename, Archive (or Restore), Delete.

Managing Your Bulk Tasks

Each uploaded task gives you the ability to:

Sort: By task name, status, or creation date
Search: Locate specific tasks by name
Filter: Toggle between All and Archived tasks
Rename: Change task names via the dropdown menu
Archive: Move completed tasks to the archive for a cleaner view
Restore: Bring archived tasks back to the active list
Delete: Remove tasks permanently via the dropdown menu
Pagination: Choose how many tasks to display per page (10, 20, 50, 100, 150, or 200)

Verify a list of email addresses via Microsoft excel

You can also verify a list of email addresses to get the deliverability status of each email.

Select the Verifier add-in tab.
Select a list of emails in your spreadsheet, and click on "Verify email addresses"

Verify a list of email addresses via Google Sheets

You can also verify a list of email addresses to get the deliverability status of each email.

Select the Verifier add-on tab.
Select a list of emails in your spreadsheet, and click on "Verify email addresses"

Understanding Email Verification Results

When you run email verification in Tomba, a new tab will be generated showing:

The email addresses
Their verification statuses
A confidence score column
The number of public sources where the email was found
Optionally, full verification details

Verify Email Addresses via API

Check the validity of any professional email address using Tomba’s powerful and accurate Email Verifier API.

from tomba.client import Clientfrom tomba.services.verifier import Verifier# Initialize the Tomba clientclient = Client()client.set_key('ta_xxxx').set_secret('ts_xxxx')# Initialize the Verifier serviceverifier = Verifier(client)# Verify the email addressresult = verifier.email_verifier('[email protected]')

Tomba offers official SDKs for popular programming languages, including:
PHP, Python, C#, Go, Rust, Ruby, Dart, JavaScript, R, Lua, Elixir Visit the full API Docs →

Task Progress Tracking

While your bulk task is processing:

A progress bar shows the percentage completed
A live counter displays items processed vs total items
Your browser tab updates with the progress percentage in the favicon
Click the bell icon to enable desktop notifications — you’ll be notified when your task finishes

Task Statuses

Each bulk task goes through one of the following statuses:

Pending — Task is queued, not yet started
Running — Currently being processed
Completed — Results are ready to download
No Result — Completed but no results were found
Failed — Task terminated with an error
Cancelled — Stopped by user or system
Expired — Data retention period has passed, results are no longer available

Task Details

Each completed task displays:

Created date and expiration date
Processing duration
Total results found
Total items processed
Verification status and cost (if verification was enabled)
Search cost in credits

Credits & Upgrade

Credits are only consumed when you download the results
If you don’t have enough credits, an upgrade prompt will appear with a link to upgrade your plan
Team members will see a notice if the team owner needs more credits

Related Resources

Bulk Operations Overview — All bulk tools in one place
Bulk API Reference — API documentation for bulk endpoints
Pricing & Plans — View plans and credit allowances
How Credits Work — Understand credit usage for bulk operations
Email Verifier API — API reference for email verification
Tomba CLI Documentation — Command-line interface reference