Verify emails in your automation workflows, CRM, email marketing tools, and custom apps. REST API for everything else.
Zapier
Automation
Verify emails in 6,000+ Zaps. Connect to Google Sheets, HubSpot, Mailchimp, Salesforce, and more — no code needed.
✓ Block invalid signups from Typeform
✓ Clean HubSpot contacts automatically
✓ Notify Slack when bulk jobs complete
Make
Automation
Build visual workflows with MailsGuard as a module. Drag, drop, verify — connect to any app in the Make ecosystem.
✓ Real-time signup validation
✓ Bulk list processing pipelines
✓ CRM enrichment workflows
n8n
Automation
Open-source workflow automation. Use the HTTP Request node with the MailsGuard REST API — full control, self-hostable.
✓ Self-hosted verification pipelines
✓ Custom webhook workflows
✓ Database-driven list cleaning
REST API
Developer
Full REST API with API key auth. Single email verification, bulk CSV jobs, webhook notifications. SDKs for Node.js and Python.
✓ Real-time signup form validation
✓ Backend email verification
✓ Bulk list processing
Webhooks
Developer
Get notified when bulk jobs complete. Set a webhook URL in your account settings and receive a POST with job results.
✓ Trigger downstream workflows
✓ Update your database on completion
✓ Send Slack notifications
Mailchimp
Email Marketing
Verify emails before adding them to Mailchimp audiences. Reduce bounces and keep your sender reputation clean.
✓ Validate before subscribe
✓ Clean existing audiences
✓ Block disposable emails
Klaviyo
Email Marketing
Validate subscriber emails before they enter Klaviyo flows. Reduce hard bounces and protect your sending domain.
✓ Pre-validate new subscribers
✓ Suppress invalid contacts
✓ Clean imported lists
HubSpot
CRM
Enrich HubSpot contacts with email verification data. Flag invalid contacts automatically as they enter your CRM.
✓ Validate contacts on creation
✓ Enrich with verification score
✓ Segment by email quality
Salesforce
CRM
Verify email addresses on Salesforce leads and contacts. Keep your CRM data clean and your campaigns deliverable.
✓ Validate leads on creation
✓ Bulk clean existing contacts
✓ Flag invalid before campaigns
Google Sheets
Productivity
Verify emails directly from Google Sheets via Zapier. Add a status column — valid, invalid, risky — to any spreadsheet.
✓ Bulk verify email columns
✓ Real-time row validation
✓ Export clean lists
Webflow
Website Builder
Add real-time email validation to Webflow forms via the MailsGuard API. Block invalid and disposable emails at submission.
✓ Form submission validation
✓ Lead generation quality control
✓ Block disposable emails
Bubble
No-Code
Integrate email verification into Bubble apps via API connector. Validate emails in any workflow without writing code.
✓ Signup form validation
✓ User onboarding quality
✓ Marketplace trust
Set a webhook URL in your account settings and MailsGuard will POST a notification when any bulk job completes. Use it to trigger downstream workflows without polling.
Webhook payload
{
"event": "job.completed",
"job_id": "uuid",
"valid_count": 850,
"invalid_count": 120,
"credits_used": 1000,
"completed_at": "2026-05-31T10:00:00Z"
}Instant notification
Fires within seconds of job completion — no polling required
Automatic retry
If your endpoint is down, we retry once after 5 seconds
Secure
Only fires to URLs you configure in your account settings
Works with anything
Zapier, Make, n8n, or your own server — any HTTPS endpoint
The REST API gives you full control. Single verification, bulk jobs, webhook callbacks — all documented and available at every price tier including free.
< 2s
Response time
99.9%
Uptime
60/min
Rate limit
500k
Bulk limit