亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

Home Operation and Maintenance Linux Operation and Maintenance How to set up anti-spam policy for debian mail server

How to set up anti-spam policy for debian mail server

Apr 13, 2025 am 07:27 AM
tool ai

How to set up anti-spam policy for debian mail server

This article introduces how to deploy a powerful anti-spam system on Debian mail server, mainly using Postgrey graylist mechanism and SpamAssassin spam filter.

1. Use Postgrey to build a gray list

  1. Install Postgrey: Use the following command to install the Postgrey package:

     sudo apt-get update && sudo apt-get -y install postgrey
  2. Configure Postgrey: Edit /etc/default/postgrey file, modify POSTGREY_OPTS parameter, and set the delay time (units in seconds, such as 60 seconds):

     sudo nano /etc/default/postgrey

    Set POSTGREY_OPTS to:

     <code>POSTGREY_OPTS="-inet=127.0.0.1:10023 -delay=60"</code>

    Save and start the Postgrey service:

     sudo systemctl start postgrey
  3. Integrate Postgrey to Postfix: Edit Postfix main configuration file /etc/postfix/main.cf and add the following line to the smtpd_recipient_restrictions parameter:

     <code>smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, check_policy_service inet:127.0.0.1:10023</code>

    Save and reload Postfix configuration:

     sudo postfix reload

2. Use SpamAssassin to filter spam

  1. Install SpamAssassin: Use the following command to install SpamAssassin:

     sudo apt-get update && sudo apt-get -y install spamassassin
  2. Configure SpamAssassin: Modify /etc/spamassassin/local.cf file as needed. For example, enable HTML mail verification:

     <code>enable_html_validation</code>
  3. Integrate SpamAssassin to Postfix: Edit /etc/postfix/main.cf file and add the following line:

     <code>content_filter = spamassassin</code>

    Save and reload Postfix configuration:

     sudo postfix reload

3. Other anti-spam strategies

In addition to the above methods, you can also consider:

  • Blacklist/Whitelist: Configure blacklist and whitelist in /etc/postfix/main.cf to block or allow mail for specific IPs or domains respectively.
  • Mail content filtering: Use more advanced mail server management tools to set filtering rules based on email subject or content.

Through the above steps, you can establish a multi-level anti-spam defense system on the Debian mail server. Please adjust the parameters according to actual conditions and regularly monitor the mail server log to ensure policy effectiveness.

The above is the detailed content of How to set up anti-spam policy for debian mail server. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What is Ethereum? What are the ways to obtain Ethereum ETH? What is Ethereum? What are the ways to obtain Ethereum ETH? Jul 31, 2025 pm 11:00 PM

Ethereum is a decentralized application platform based on smart contracts, and its native token ETH can be obtained in a variety of ways. 1. Register an account through centralized platforms such as Binance and Ouyiok, complete KYC certification and purchase ETH with stablecoins; 2. Connect to digital storage through decentralized platforms, and directly exchange ETH with stablecoins or other tokens; 3. Participate in network pledge, and you can choose independent pledge (requires 32 ETH), liquid pledge services or one-click pledge on the centralized platform to obtain rewards; 4. Earn ETH by providing services to Web3 projects, completing tasks or obtaining airdrops. It is recommended that beginners start from mainstream centralized platforms, gradually transition to decentralized methods, and always attach importance to asset security and independent research, to

What are the websites for real-time price query of Bitcoin? Recommended websites that can view Bitcoin K-line and depth chart What are the websites for real-time price query of Bitcoin? Recommended websites that can view Bitcoin K-line and depth chart Jul 31, 2025 pm 10:54 PM

In the digital currency market, real-time mastering of Bitcoin prices and transaction in-depth information is a must-have skill for every investor. Viewing accurate K-line charts and depth charts can help judge the power of buying and selling, capture market changes, and improve the scientific nature of investment decisions.

How to check the main trends of beginners in the currency circle How to check the main trends of beginners in the currency circle Jul 31, 2025 pm 09:45 PM

Identifying the trend of the main capital can significantly improve the quality of investment decisions. Its core value lies in trend prediction, support/pressure position verification and sector rotation precursor; 1. Track the net inflow direction, trading ratio imbalance and market price order cluster through large-scale transaction data; 2. Use the on-chain giant whale address to analyze position changes, exchange inflows and position costs; 3. Capture derivative market signals such as futures open contracts, long-short position ratios and liquidated risk zones; in actual combat, trends are confirmed according to the four-step method: technical resonance, exchange flow, derivative indicators and market sentiment extreme value; the main force often adopts a three-step harvesting strategy: sweeping and manufacturing FOMO, KOL collaboratively shouting orders, and short-selling backhand shorting; novices should take risk aversion actions: when the main force's net outflow exceeds $15 million, reduce positions by 50%, and large-scale selling orders

Ethereum ETH latest price APP ETH latest price trend chart analysis software Ethereum ETH latest price APP ETH latest price trend chart analysis software Jul 31, 2025 pm 10:27 PM

1. Download and install the application through the official recommended channel to ensure safety; 2. Access the designated download address to complete the file acquisition; 3. Ignore the device safety reminder and complete the installation as prompts; 4. You can refer to the data of mainstream platforms such as Huobi HTX and Ouyi OK for market comparison; the APP provides real-time market tracking, professional charting tools, price warning and market information aggregation functions; when analyzing trends, long-term trend judgment, technical indicator application, trading volume changes and fundamental information; when choosing software, you should pay attention to data authority, interface friendliness and comprehensive functions to improve analysis efficiency and decision-making accuracy.

BTC digital currency account registration tutorial: Complete account opening in three steps BTC digital currency account registration tutorial: Complete account opening in three steps Jul 31, 2025 pm 10:42 PM

First, select well-known platforms such as Binance Binance or Ouyi OKX, and prepare your email and mobile phone number; 1. Visit the official website of the platform and click to register, enter your email or mobile phone number and set a high-strength password; 2. Submit information after agreeing to the terms of service, and complete account activation through the email or mobile phone verification code; 3. After logging in, complete identity authentication (KYC), enable secondary verification (2FA), and regularly check security settings to ensure account security. After completing the above steps, you can successfully create a BTC digital currency account.

btc trading platform latest version app download 5.0.5 btc trading platform official website APP download link btc trading platform latest version app download 5.0.5 btc trading platform official website APP download link Aug 01, 2025 pm 11:30 PM

1. First, ensure that the device network is stable and has sufficient storage space; 2. Download it through the official download address [adid]fbd7939d674997cdb4692d34de8633c4[/adid]; 3. Complete the installation according to the device prompts, and the official channel is safe and reliable; 4. After the installation is completed, you can experience professional trading services comparable to HTX and Ouyi platforms; the new version 5.0.5 feature highlights include: 1. Optimize the user interface, and the operation is more intuitive and convenient; 2. Improve transaction performance and reduce delays and slippages; 3. Enhance security protection and adopt advanced encryption technology; 4. Add a variety of new technical analysis chart tools; pay attention to: 1. Properly keep the account password to avoid logging in on public devices; 2.

Why does Binance account registration fail? Causes and solutions Why does Binance account registration fail? Causes and solutions Jul 31, 2025 pm 07:09 PM

The failure to register a Binance account is mainly caused by regional IP blockade, network abnormalities, KYC authentication failure, account duplication, device compatibility issues and system maintenance. 1. Use unrestricted regional nodes to ensure network stability; 2. Submit clear and complete certificate information and match nationality; 3. Register with unbound email address; 4. Clean the browser cache or replace the device; 5. Avoid maintenance periods and pay attention to the official announcement; 6. After registration, you can immediately enable 2FA, address whitelist and anti-phishing code, which can complete registration within 10 minutes and improve security by more than 90%, and finally build a compliance and security closed loop.

Where to look at the popularity list in the currency circle? Suggestions for using mainstream Bitcoin websites Where to look at the popularity list in the currency circle? Suggestions for using mainstream Bitcoin websites Jul 31, 2025 pm 10:36 PM

During the process of investing in the currency circle, paying attention to the market popularity and activity of the currency will help capture potential coins and popular trends. The popularity list reflects the transaction volume, social discussion and market attention of the currency, and is an effective tool for novices to quickly understand market trends.

See all articles