MailboxValidator
MailboxValidator checks whether an email address exists and can receive mail.
Updated April 2026
Overview: What is MailboxValidator?
It combines syntax checks, MX record lookups, and mailbox verification in a single API. Teams use it to clean contact lists and protect sender reputation.
MailboxValidator is an email verification service that validates addresses through multiple checks. It inspects syntax, confirms the domain has valid MX records, and tests whether the specific mailbox exists on the mail server. The tool also flags disposable email providers and role-based addresses like info@ or admin@. Users can validate emails one at a time via API or process large lists in bulk through a file upload. Integrations connect directly to popular email platforms such as Mailchimp, SendGrid, and AWeber.
Fit: Ideal customer profile.
Email marketers and developers at startups and mid-market companies who need to clean contact lists and integrate verification into existing workflows.
- Seed
- SMB
- Mid-market
Capabilities
Key features.
01
Email syntax validation
02
MX record verification
03
Disposable email detection
04
Role-based email identification
05
Bulk list validation via file upload
06
Real-time single email API checks
07
Mailbox existence confirmation
08
Integrations with major email platforms
09
Free trial with 100 queries
Usage
How to use MailboxValidator.
Teams upload a CSV or text file to validate large lists in one batch, or connect the API to check addresses at the point of collection in real time. Clean lists are then exported or synced to connected email platforms before the next campaign send.
Cost
Pricing.
$19.95/ Per credit
Starts at $19.95 for 1,000 queries with 30-day validity. A free trial provides 100 queries at no cost.
BULK-TRIAL
$0.00
- 30-Day Validity
- 100 Queries
- Standard Support
- < 1 hour response
- Free
- Try Now
BULK-1
$19.95
- 30-Day Validity
- 1,000 Queries
- Email Support
- < 4 hours response
- $$0.02 / Query
- Buy Now
BULK-5
$39.95
- 30-Day Validity
- 5,000 Queries
- Email Support
- < 4 hours response
- $$0.008 / Query
- Buy Now
BULK-10
$59.95
- 30-Day Validity
- 10,000 Queries
- Email Support
- < 4 hours response
- $$0.006 / Query
- Buy Now
BULK-50
$149.95
- 30-Day Validity
- 50,000 Queries
- Email Support
- < 12 hours response
- $$0.003 / Query
- Buy Now
BULK-100
$199.95
- 30-Day Validity
- 100,000 Queries
- Email Support
- < 24 hours response
- $$0.002 / Query
- Buy Now
BULK-500
$399.95
- 30-Day Validity
- 500,000 Queries
- Email Support
- < 48 hours response
- $$0.0008 / Query
- Buy Now
BULK-1000
$699.95
- 30-Day Validity
- 1,000,000 Queries
- Email Support
- < 72 hours response
- $$0.0007 / Query
- Buy Now
At a glance
Quick facts.
- Stack position
- Deliverability
- Category
- Data Sources, Sales Tools
- Best for
- Seed, SMB, Mid-market
- Pricing
- From $19.95/Per credit
Subcategories
- Data Validation & Verification
- Email Verification
Questions
Frequently asked.
How do you use MailboxValidator?
Upload a CSV or text file for bulk list validation, or call the API to check individual emails in real time. Both methods return detailed validation results.
What does MailboxValidator cost?
Plans start at $19.95 for 1,000 queries and scale up to $699.95 for one million queries. Each plan is valid for 30 days from purchase.
Why use MailboxValidator over alternatives?
It combines syntax checks, MX verification, and mailbox confirmation to catch invalid addresses before they cause bounces. This protects sender reputation and improves campaign performance.
How does the email verification process work?
The service checks address format, looks up the domain MX records, and contacts the mail server to confirm the mailbox exists. Results indicate whether the address is valid and deliverable.
Is there a free plan available?
A free bulk trial provides 100 validation queries at no charge. Demo options are also available to test the service before committing.
Which platforms integrate with MailboxValidator?
The service connects with popular email tools including Mailchimp, SendGrid, and AWeber. These integrations allow validated lists to flow directly into your sending platform.
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