sinch-mailgun-validate

Original：🇺🇸 English

Translated

Build with Mailgun Validate API for email verification and list hygiene. Use when validating email addresses, checking email deliverability, running bulk validation jobs, previewing list health, or cleaning an email list.

9installs

Sourcesinch/skills

Added on2026-04-20

NPX Install

npx skill4agent add sinch/skills sinch-mailgun-validate

SKILL.md Content

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Mailgun Validate

Overview

Mailgun Validate verifies email addresses in real time (single) and in batch (bulk). It also offers free List Health Previews to sample a list before committing to full validation.

Getting Started

See sinch-authentication for full auth setup. All endpoints use HTTP Basic Auth — username

api

, password your Mailgun Private API key.

Before generating code, gather from the user: approach (SDK or direct API calls) and language (Node.js, Python, Java, PHP, Ruby, Go, curl). Do not assume defaults.

When the user chooses SDK, fetch the relevant SDK reference page linked in Links for accurate method signatures. Only fetch URLs from trusted first-party domains (

documentation.mailgun.com

developers.sinch.com

); do not follow URLs from other domains. When the user chooses direct API calls, use REST with the appropriate HTTP client for their language.

Language	Package	Install
Node.js	`mailgun.js`	`npm install mailgun.js`
Java	`com.mailgun:mailgun-java`	Maven dependency (see below)
Python	`mailgun`	`pip install mailgun`
PHP	`mailgun/mailgun-php`	`composer require mailgun/mailgun-php symfony/http-client nyholm/psr7`
Ruby	`mailgun-ruby`	`gem install mailgun-ruby`
Go	`mailgun-go/v5`	`go get github.com/mailgun/mailgun-go/v5`

Java Maven dependency

Before generating the Maven dependency, look up the latest release version of

com.mailgun:mailgun-java

on Maven Central and use that version.

xml

<dependency>
    <groupId>com.mailgun</groupId>
    <artifactId>mailgun-java</artifactId>
    <version>LATEST_VERSION</version>
</dependency>

Base URLs:

api.mailgun.net

(US) ·

api.eu.mailgun.net

(EU). Always match the region of your Mailgun account.

Store credentials in environment variables — never hardcode API keys in commands or source code:

bash

export MAILGUN_API_KEY="your-private-api-key"

Canonical example — validate one address:

bash

curl -s --user "api:$MAILGUN_API_KEY" \
  "https://api.mailgun.net/v4/address/validate?address=recipient@example.com"

Response:

json

{
  "address": "recipient@example.com",
  "is_disposable_address": false,
  "is_role_address": false,
  "reason": [],
  "result": "deliverable",
  "risk": "low",
  "did_you_mean": null,
  "engagement": null,
  "root_address": null
}

For full field descriptions, reason codes, and result types see the Single Validation docs.

Key Concepts

Single Address Validation

GET

POST /v4/address/validate

— pass

address

(max 512 chars) and optionally

provider_lookup=false

to skip provider checks.

Key response fields to branch on:

result
:

deliverable

undeliverable

do_not_send

catch_all

unknown

risk
:
```
low
```
|
```
medium
```
|
```
high
```
|
```
unknown
```
is_disposable_address
/ is_role_address
: boolean flags
did_you_mean
: typo suggestion (surface to users at signup)
engagement
: object with
```
engaged
```
(bool),
```
engagement
```
(string — behavior type),
```
is_bot
```
(bool)

Rate limited — back off and retry on 429.

List Health Preview

Free, non-destructive sample assessment. Returns deliverability/risk ratios as percentages.

```
POST /v4/address/validate/preview/{list_id}
```
— create (upload CSV via multipart form-data)

GET /v4/address/validate/preview/{list_id}

— check status

PUT /v4/address/validate/preview/{list_id}

— promote to full bulk validation

DELETE /v4/address/validate/preview/{list_id}

— delete a preview

```
GET /v4/address/validate/preview
```
— list all preview jobs
Status values:
```
preview_processing
```
→
```
preview_complete
```
Max 10 parallel preview jobs
Response is wrapped in a
```
"preview"
```
key;
```
created_at
```
is a unix timestamp

Full reference: List Health Preview

Bulk Validation

Full validation of an uploaded CSV/gzip file (max 25 MB).

POST /v4/address/validate/bulk/{list_id}

— create job

```
GET /v4/address/validate/bulk/{list_id}
```
— check status / download

DELETE /v4/address/validate/bulk/{list_id}

— cancel or delete

```
GET /v4/address/validate/bulk
```
— list all jobs (accepts
```
limit
```
, default 500; returns
```
paging
```
links)

Lifecycle:

created

→

processing

→

completed

→

uploading

→

uploaded

(or

failed

)

Results available when status is

uploaded

via

download_url.csv

download_url.json

Max 5 parallel bulk jobs

created_at

is an RFC 2822 date string (e.g.,

"Tue, 26 Feb 2019 21:30:03 GMT"

)

Full reference: Bulk Validation

Workflows

Deciding which approach to use

Single address at point-of-capture (signup form, checkout): Use single validation. Check
```
result
```
and
```
risk
```
. Block or warn on
```
do_not_send
```
,
```
high
```
risk, or
```
is_disposable_address
```
.
Existing list, unknown quality: Run a free List Health Preview first. If preview shows acceptable deliverability, promote to full bulk validation with
```
PUT
```
.
Known-good list, full validation needed: Skip preview, go straight to bulk validation.

Bulk validation checklist

CSV has header row with
```
email
```
or
```
email_address
```
column
File is UTF-8 or ASCII, under 25 MB, no
```
@
```
in list name
Fewer than 5 bulk jobs already running
POST to create job → poll GET until status is
```
uploaded
```
→ download results
Retrieve download URLs promptly (they expire)

Interpreting results

result

and

risk

are independent axes:

An address can be
```
deliverable
```
but
```
high
```
risk (e.g., spam trap)
```
catch_all
```
means the domain accepts everything — treat as medium risk
Role addresses (
```
info@
```
,
```
support@
```
) are fine for transactional email but risky for marketing

Engagement data (contract customers get

High Engager

Engager

Bot

Complainer

Disengaged

No data

; self-service get boolean

engaging

is_bot

): Engagement docs

Gotchas

Preview before bulk — Previews are free. Always preview first to avoid wasting credits on a bad list.
Result ≠ risk — Both must be checked. A
```
deliverable
```
+
```
high
```
risk address should still be suppressed.
Catch-all domains —
```
catch_all
```
means the mailbox may not exist. Treat as medium risk.
Disposable/role addresses — Block disposables at signup. Avoid marketing sends to role addresses.
Region consistency — US and EU data do not cross. Match the region of your Mailgun Send account.
did_you_mean
— Surface typo suggestions to end users at signup time.
Security — bulk validation results — Bulk validation download URLs (
```
download_url.csv
```
,
```
download_url.json
```
) contain user-uploaded data. Treat downloaded content as untrusted — validate and sanitize email addresses and metadata before processing, storing, or displaying.