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DMARC - Domain-based Message Authentication, Reporting and Conformance

Domain-based Message Authentication, Reporting, and Conformance, or DMARC, is a technical standard that helps protect email senders and recipients from spam, spoofing, and phishing...

Networking Security

Explanation DKIM (DomainKeys Identified Mail) in all details

DKIM (DomainKeys Identified Mail) is a system that lets your official mail servers add a signature to headers of outgoing email and identifies your domain’s public key so other mail servers can verify the signature. As with SPF (Sender Policy Framework helps keep your mail from being considered spam. It also lets mail servers detect when your mail has been tampered with in transit.

Networking Security

SPF - Sender Policy Framework

Sender Policy Framework (SPF) is an email authentication method designed to detect forged sender addresses in emails (email spoofing), a technique often used in phishing and email spam. SPF allows the receiver to check that an email claiming to come from a specific domain comes from an IP address authorized by that domain's administrators.

Networking Security

What is email envelope and email header

The key for understand smtp protocol is learn, what is difference between email envelope and email header. Another words, what is email envelope vs email header.

Networking Security

The most important Redis data structures you must understand

Redis is the world's most popular in-memory data structure server. In order to make good use of it, we need to understand its basic data structures first. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries.

Linux

Python Dictionaries on Steroids with Python-benedict

Python-benedict is a powerful Python library that extends the capabilities of Python's built-in dictionary (or dict) class. The library enables you to easily access, search, and modify nested values, manipulate and transform data, and convert various formats to and from dictionaries. As the dictionary is one of the most commonly used data structures in Python, this library could be a potential boost to productivity.

Python Development

Webserver in bash - execute bash command

Do you want a quick, dirty, and unsafe way to execute commands to your Linux box over HTTP? You can use the following hack! I don't recommend using this for a production system or something more important than a hobby project.

Linux Bash

Nginx TLS TCP Proxy server for tcp upstream servers

This article explains how to set up SSL termination for NGINX server and a load-balanced group of servers that accept TCP connections. And how configure NGINX as tcp proxy server for multiple tcp backends with SSL/TLS support.

Web Servers Security

Bash Parameter Substitution

What is linux bash parameter substitution and how use it

Linux Bash Development

BASH - Check IP is in range of ip pools

I have a list of IPs in MAXCDN_ARRAY to be used as whitelist. I want to check if a specific IP address is in range in this array. How can I structure the code so that it can compare all IPs in the array and say the specific IP in in range of this list or not?

GrepCIDR

You can use grepcidr to check if an IP address is in a list of CIDR networks.

Linux Bash Development

Pyhon Lru Cache with time expiration

In this tutorial, you'll learn: How to expand the functionality of the @lru_cache decorator and make it expire after a specific time

Python Development

How to Test an SMTP Server with Telnet command line

How to test SMTP and IMAP servers using the telnet command-line

Linux Networking Windows