Operated by Sourcelane✓ verified
Verify email addresses in bulk: syntax, MX records, disposable domains, role accounts, and live SMTP deliverability checks for clean, sendable lists.
A bulk email list cleaning and deliverability validation connector that performs multi-step verification for each address: syntax validation, DNS MX record lookup (including RFC 7505 null MX handling), live SMTP mailbox probing to test deliverability, disposable/domain blocklist detection against an extensive list of throwaway providers, role-account detection for shared inboxes, and optional catch-all domain detection. The connector outputs per-address indicators for syntax correctness, domain mail-server existence and host, disposable and role flags, catch-all status (if enabled), SMTP probe results from a live handshake, and an overall deliverability classification (valid, risky, invalid, or unknown) with an explanatory reason.
Verified Sep 28, 3:55 AM
$0.0018
per email
Up to 100 per call. Only pay for results returned; failed calls are refunded.
Scrub a purchased or scraped lead list before an email campaign
Reduce bounce rate and protect sender reputation before a cold-outbound send
Validate signup-form emails in a batch backfill
Deduplicate and grade an email list by deliverability confidence
List of email addresses to verify, one per line.
Optional settings
| Window | Uptime | Success rate | p50 | p95 | Calls |
|---|---|---|---|---|---|
| 24h | — | — | — | — | 0 |
| 7d | — | — | — | — | 0 |
| 30d | — | — | — | — | 0 |
Call it through Sourcelane's gateway or MCP server. We run the connector, apply your agent's spend guardrails, and bill only the results returned.
Call it via Sourcelane
curl -X POST https://api.usesourcelane.com/v1/call \
-H "Authorization: Bearer sl_live_your_agent_key" \
-H "Content-Type: application/json" \
-d '{"listing":"bulk-email-verifier","params":{"emails":["test@gmail.com"]},"maxResults":10}'Request params
| Field | Type | Required | Description |
|---|---|---|---|
emails | array | required | List of email addresses to verify, one per line. |
checkSmtp | boolean | optional | Connect to each domain's mail server and check whether the mailbox actually accepts mail (in addition to syntax and MX checks). Slower, but catches invalid mailboxes that pass MX-only checks. Some networks block outbound SMTP, in which case results fall back to 'unknown' for that check. |
checkCatchAll | boolean | optional | For domains that accept the mail, also probe a random nonexistent mailbox at the same domain. If it's also accepted, the domain is catch-all and the address is marked risky instead of valid. Adds one extra SMTP check per unique domain. Requires 'Check SMTP deliverability' to be on. |
Each result contains
| Field | Type | Description |
|---|---|---|
email | string | |
isValidSyntax | boolean | Is Valid Syntax |
domain | string | Domain |
hasMxRecord | boolean | Has Mx Record |
mxHost | string | Mx Host |
isDisposable | boolean | Is Disposable |
isRoleAccount | boolean | Is Role Account |
smtpCheck | string | Smtp Check |
isCatchAll | null | Is Catch All |
status | string | Status |
reason | string | Reason |
Pick your tool and connect in under a minute. Then just ask — for example: “For these 50 domains, find contact emails and what e-commerce platform they run on.”
Connect Claude
Web, desktop and mobile. One click, then confirm.
Adds the Sourcelane MCP server with your key as a header.
claude mcp add --transport http sourcelane https://api.usesourcelane.com/mcp \
--header "Authorization: Bearer sl_live_your_agent_key"Alternative to the connector URL: add to claude_desktop_config.json, then restart Claude.
{
"mcpServers": {
"sourcelane": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://api.usesourcelane.com/mcp",
"--header",
"Authorization:${AUTH_HEADER}"
],
"env": {
"AUTH_HEADER": "Bearer sl_live_your_agent_key"
}
}
}
}Add to ~/.cursor/mcp.json (or Windsurf's mcp_config.json).
{
"mcpServers": {
"sourcelane": {
"url": "https://api.usesourcelane.com/mcp",
"headers": {
"Authorization": "Bearer sl_live_your_agent_key"
}
}
}
}Save as .vscode/mcp.json. VS Code prompts for your key once.
{
"servers": {
"sourcelane": {
"type": "http",
"url": "https://api.usesourcelane.com/mcp",
"headers": {
"Authorization": "Bearer ${input:sourcelane-key}"
}
}
},
"inputs": [
{
"type": "promptString",
"id": "sourcelane-key",
"description": "Sourcelane agent key",
"password": true
}
]
}Create a GPT → Actions → Import from URL, then Authentication: API Key, Bearer.
https://usesourcelane.com/openapi.jsonOne POST. Pass maxResults to cap cost.
curl -X POST https://api.usesourcelane.com/v1/call \
-H "Authorization: Bearer sl_live_your_agent_key" \
-H "Content-Type: application/json" \
-d '{"listing":"bulk-email-verifier","params":{"emails":["test@gmail.com"]},"maxResults":10}'Wrap the REST call as a tool, or point an MCP client at the endpoint.
import requests
res = requests.post(
"https://api.usesourcelane.com/v1/call",
headers={"Authorization": "Bearer sl_live_your_agent_key"},
json={
"listing": "bulk-email-verifier",
"params": {"emails":["test@gmail.com"]},
"maxResults": 10,
},
timeout=300,
)
body = res.json()
print(body["receipt"]["chargedMicros"], "micro-USD for", body["receipt"]["results"], "results")
print(body["data"])—
0 reviews
Leave a review
Loading reviews…