# SendGrid Email Configuration Guide

## Environment Variables Setup

Add the following variables to your `.env` file:

```env
# SendGrid Configuration (REQUIRED)
SENDGRID_API_KEY=your-sendgrid-api-key-here
MAIL_FROM_ADDRESS=your-verified-sender@example.com
MAIL_FROM_NAME="Your App Name"
```

## Important Notes

1. **API Key**: Replace `your-sendgrid-api-key-here` with your actual SendGrid API key
2. **From Address**: Replace `your-verified-sender@example.com` with a verified sender address from your SendGrid account
3. **From Name**: Will use your app name from the environment

## How the System Works

The application now uses **only SendGrid API** for all email operations:
- All emails are sent through the SendGrid API using the `EmailHelper` class
- No SMTP configuration is required
- All email methods (OTP, password reset, scan results, etc.) use SendGrid directly

## Troubleshooting

If you see errors like:
- "SendGrid API key is not configured!" - Set the `SENDGRID_API_KEY` in your .env
- "From address is not configured!" - Set MAIL_FROM_ADDRESS in your .env
- "401 Unauthorized" - Your API key is invalid, expired, or doesn't have mail.send permission

## Verifying Configuration

After setting up, you can test by:
1. Clear config cache: `php artisan config:clear`
2. Try sending an OTP or test email
3. Check `storage/logs/laravel.log` for detailed debug information