Understanding logrotate utility, How does logrotate know if should rotate log files or not and How debug Logrotate utility.
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Python DocStrings, Annotations and PEP8
Guide how to write perfect Python DocStrings, how write annotations and what is PEP8
Explanation DMARC (Domain-based Message Authentication, Reporting and Conformance) in all details
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.
Explanation SPF (Sender Policy Framework) in all details
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. The list of authorized sending hosts and IP addresses for a domain is published in the DNS records for that domain. SPF together with DKIM are based stones to DMARC
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.
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.
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.
Python3 f-Strings and string formatting syntax
As of Python 3.6, f-strings are a great new way to format string. Not only are they more readable, more concise, and less prone to error than other ways of formatting, but they are also faster!
Building Python Real World Application - part 01 - Interactive Dictionary
The first application we are going to build is a dictionary. An interactive dictionary.
Add or Change SSL/TLS certificate in Lotus Domino
IBM Notes (formerly Lotus Notes; see Branding below) and IBM Domino (formerly Lotus Domino[1]) are the client and server, respectively, of a collaborative client-server software platform sold by IBM. And We need to change the ssl certificate in this IBM product
