Haraka邮件服务器：是否可排除指定收件人域名？

Absolutely, you can implement this domain exclusion requirement in Haraka—its flexible plugin architecture makes custom rules like this straightforward. Here's how to build exactly what you're asking for:

Step 1: Create a Custom Haraka Plugin #

Haraka relies on plugins for almost all its functionality, so we'll write a simple plugin to handle domain exclusion.

1. Navigate to your Haraka plugins directory (usually ./plugins/ in your Haraka installation folder).
2. Create a new file named exclude_domains.js with the following code:

const fs = require('fs');
const path = require('path');

// Path to your excludedomain file - adjust this to match your actual file location
const EXCLUDE_FILE = path.join(__dirname, '../config/excludedomain');

// Load excluded domains once on plugin init
let excludedDomains = new Set();

exports.register = function () {
    this.load_excluded_domains();
};

exports.load_excluded_domains = function () {
    try {
        const content = fs.readFileSync(EXCLUDE_FILE, 'utf8');
        // Split by semicolons or newlines, trim whitespace, and filter out empty entries
        excludedDomains = new Set(
            content.split(/[;\n]/)
                .map(domain => domain.trim().toLowerCase())
                .filter(domain => domain)
        );
        this.loginfo(`Loaded ${excludedDomains.size} excluded domains`);
    } catch (err) {
        this.logerror(`Failed to load excluded domains file: ${err.message}`);
    }
};

// Hook into the queue_before stage to filter recipients before queuing
exports.hook_queue_before = function (next, connection) {
    const txn = connection.transaction;
    const validRecipients = [];

    for (const rcpt of txn.rcpt_to) {
        const recipientDomain = rcpt.host.toLowerCase();
        if (!excludedDomains.has(recipientDomain)) {
            validRecipients.push(rcpt);
        } else {
            this.loginfo(`Rejected recipient ${rcpt.address} (domain ${recipientDomain} is excluded)`);
        }
    }

    // Update the transaction's recipient list to only include valid ones
    txn.rcpt_to = validRecipients;

    // If no valid recipients left, reject the transaction
    if (txn.rcpt_to.length === 0) {
        return next(DENY, 'No valid recipients (all domains are excluded)');
    }

    next();
};

Step 2: Set Up Your Exclusion List #

1. Create a excludedomain file in your Haraka config/ directory.
2. Add your excluded domains, either separated by semicolons or newlines (the plugin handles both):

first.com;second.com
third-bad.com

Step 3: Enable the Plugin #

1. Open your Haraka config/plugins file.
2. Add the following line to enable your new plugin (place it early enough in the list to ensure it runs before queuing):

exclude_domains

Step 4: Test the Setup #

• Send a test email to first@first.com and third@third.com. The plugin will filter out the first@first.com recipient, so only third@third.com should receive the email.
• Check Haraka's logs to verify the exclusion is working (look for lines like Rejected recipient first@first.com (domain first.com is excluded)).

Notes: #

• Case Insensitivity: The plugin converts domains to lowercase, so First.COM will be treated the same as first.com.
• File Reload: If you update the excludedomain file, you'll need to restart Haraka or use Haraka's plugin reload command to pick up changes.
• Error Handling: The plugin logs errors if it can't read the exclusion file, so you'll know if there's a path issue.

内容的提问来源于stack exchange，提问作者edit2112