Lettr email verification with ValidReach
Transactional email API and marketing email platform for SaaS teams. Connect Lettr to ValidReach via REST API webhooks, workflow automation (n8n, Make, Zapier), or CSV/XLSX batch exports to verify email addresses before sending or syncing.
How it works with Lettr
Connect via HTTPS webhooks, automation runners (n8n, Make, Zapier), or CSV/XLSX batch exports.
- 1
Connect ValidReach to Lettr via REST API webhooks, automation workflows, or CSV/XLSX list exports.
- 2
Verify new subscribers at capture and existing Lettr audiences before major broadcasts.
- 3
Store verification status and reason codes as contact tags or custom fields for segmentation.
- 4
Suppress invalid and disposable rows before Lettr sends to keep hard-bounce rates near zero.
When to use ValidReach with Lettr
Three common patterns teams deploy to stop hard bounces and protect domain reputation.
Protect Lettr sender reputation
Remove hard-bouncing and deactivated mailboxes before Lettr dispatches newsletters, lifecycle flows, or announcements.
Real-time signup & webhook verification
Validate new addresses at capture so typos and disposable domains never enter your Lettr audience.
Scheduled list re-verification
Audit aging Lettr segments before seasonal campaigns using bulk CSV/XLSX verification with full column preservation.
Mapping ValidReach fields into Lettr
Call POST /api/v1/verify/single from your webhook or workflow runner and route contacts based on the returned status.
POST https://validreach.dev/api/v1/verify/single
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json
{
"email": "contact@example.com"
}validreach_status | Recommended Lettr Action |
|---|---|
| valid | Allow into active Lettr campaigns & flows |
| catchall / role | Tag for low-volume sending or manual review |
| unknown | 0 credits billed; retry later or require opt-in click |
| invalid / disposable | Suppress or reject before Lettr send |
Need multi-step templates? Browse verification workflows or read the integration guides.
Lettr email verification questions
- Does ValidReach require a native plugin inside Lettr?
- No. ValidReach connects to Lettr through standard HTTPS webhooks, our REST API (POST /api/v1/verify/single and /api/v1/verify/file), or automation runners such as n8n, Make, and Zapier—so you can inspect and control every field mapped into Lettr.
- How should I handle catch-all or unknown results in Lettr?
- Route confirmed valid addresses directly into active Lettr flows, suppress invalid and disposable addresses immediately, and tag catchall or unknown records for low-volume sending or a later retry. ValidReach never charges credits for unknown results.
- Can I verify an existing Lettr export without losing custom columns?
- Yes. Upload your Lettr CSV or .xlsx export to /dashboard/lists or POST /api/v1/verify/file, then download results with include_original=true to keep every original Lettr column alongside the verification status and reason code.
- What is the fastest way to automate Lettr verification?
- Download the workflow definition JSON on this page or connect Lettr's webhook trigger to POST https://validreach.dev/api/v1/verify/single via n8n, Make, or Zapier.
Related email service provider & lifecycle integrations
Explore other platforms in the same category or return to the full integrations directory.
Connect ValidReach to Lettr
Start with 100 free credits, call the REST API or workflow node, and keep every list clean.