Email Verifier

A Go tool that checks domain email security configurations (MX, SPF, DMARC records).

⚠️ Important Limitation

Only verifies DOMAINS (like gmail.com) - NOT individual email addresses (like user@gmail.com).

Individual email verification is impossible due to privacy/security restrictions.

Quick Start

API Server (for web integration)

go mod tidy
go build -o email-verifier-api.exe api_server.go
./email-verifier-api.exe

Access: http://localhost:8080

CLI Tool (for command line)

cd cli
go build -o email-verifier-cli.exe main.go
echo "gmail.com" | ./email-verifier-cli.exe

What It Checks

• MX Records: Can domain receive emails?
• SPF Records: Email spoofing protection
• DMARC Records: Email security policies

API Endpoints

GET  /api/v1/health
GET  /api/v1/verify/domain/{domain}
POST /api/v1/verify/domains

Example Usage

API:

curl http://localhost:8080/api/v1/verify/domain/gmail.com

CLI:

echo "gmail.com" | ./email-verifier-cli.exe

Output Format

{
  "domain": "gmail.com",
  "hasMX": true,
  "hasSPF": true,
  "spfRecord": "v=spf1 include:_spf.google.com ~all",
  "hasDMARC": true,
  "dmarcRecord": "v=DMARC1; p=reject"
}

Use Cases

• Domain security auditing
• Email infrastructure validation
• Compliance checking
• Bulk domain analysis

Note: Cannot verify if individual users exist - this is technically impossible.