smtp - MyBlueLinux.com

Test abd Debug SPF with command line

How to troubleshoot postfix-policyd-spf-python?

Networking Security

Set up DMARC (verification) for Postfix on Debian server

This tutorial will be showing you how to set up OpenDMARC with Postfix SMTP server on Debian/Ubuntu server to block email spoofing and spam.

Security Networking

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

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

Postfix - how log email headers like From, To and Subject

This is a little trick for Postfix, it lets you log the subject, from and to of all the emails postfix sends (or which pass through it if you run it as a relay). It comes in handy when you need to debug an email issue and need to confirm your mailserver has sent the message.

Networking

Most secure SSL/TLS configuration for Apache, Nginx, Postfix, Dovecot, HAProxy and other

What is a cipher suite?

Cipher suites decide how secure, compatible and fast your HTTPS website is. A cipher suite is a set of information that helps determine how your web server will communicate secure data over HTTPS.
A web server uses certain protocols and algorithms to determine how it will secure your web traffic. These are the ingredients of a secure connection. A cipher suite is essentially a list of those ingredients.

Security Linux Networking Web Servers