Email Authentication by using DMARC, DKIM and SPF
In this post I want to show how you can prevent that your email domain is abused for email spoofing…
Set up DMARC (verification) for Postfix on Ubuntu
Last week I wrote a post about how to set up SPF and DKIM for Postfix on Ubuntu, today I…
Set up DomainKeys Identified Mail (DKIM) for Exchange Online
Either you can set up DKIM by using the Microsoft 365 Defender portal or manually by using PowerShell. First I…
Configure Postfix to block and reject Unsolicited Messages or Spam
Below I want to show how to configure the built-in options for Postfix to prevent unsolicited commercial emails (UCE) or…
Set up Ubuntu’s Built-In Firewall
Ubuntu’s built-in firewall is named ufw (uncomplicated firewall). Actually Ufw is just an utility which makes it easier to configure…
Set up ownCloud on Ubuntu
Today I wanna show how to set up ownCloud (release 10.11) on Ubuntu 22.04.1 LTS. ownCloud is an open-source file sync,…
Set up SSH private/public Key Pair without using Password Authentication on Linux
SSH keys are not only more convenient but also improve the security in contrast to the password authentication, provided the…
Set up SPF and DKIM for Postfix on Ubuntu
In this post I want to show how to set up the SPF (Sender Policy Framework) and DomainKeys Identified Mail (DKIM)…
ZeroConfigExchange & ZeroConfigExchangeOnce
Creating an Outlook profile is very easy and a wizard will guide you throughout the process. The wizard therefore uses…
Outlook 2016/2019 Click to run – Adding multiple Office 365 E-Mail Profiles – Sorry, another account from your organization is already signed in on this computer
Recently I wanted to configure two E-Mail profiles on a Windows 10 computer, each of them should include an Office…
