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.

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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.

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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.

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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!

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What’s __init__ for me?

Designing for Python package import patterns

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Building Python Real World Application - part 01 - Interactive Dictionary

The first application we are going to build is a dictionary. An interactive dictionary.

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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

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ProFTPd Server with virtual users and in SFTP mode

napis description-o com je clanok

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Working with Vsftpd as FTPS server with virtual users and SSL certificates in Debian or Ubuntu

In this tutorial, we will show you how to easily create an FTPS server with virtual users using the vsFTPd daemon on Debian or Ubuntu

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Understanding Key Differences Between FTP, FTPS and SFTP

Perhaps the most common protocols used in file transfer today are FTP, FTPS and SFTP. While the acronyms for these protocols are similar, there are some key differences among them, in particular how data are exchanged, the level of security provided and firewall considerations. Learning these key differences can help you when choosing a file transfer protocol or troubleshooting common connection issues.

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Active and Passive FTP Simplified - Understanding FTP Ports

If a client encounters problems when connecting to your FTP server, one of the first things you might want to check is your FTP data transfer mode. Depending on certain network configurations, this mode should be set to either active or passive. In this post, you’ll understand the salient points of active and passive FTP and learn how to avoid connectivity issues associated with them.

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Python Map, Filter and Reduce functions

These are three functions which facilitate a functional approach to programming. We will discuss them one by one and understand their use cases.

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