nixCraft Linux / UNIX Newsletter

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As you may know, email spoofing allows attackers to pose as someone else to gain illegal profit. For example, I only use webmaster@cyberciti.biz for communication, but someone might create a spoofed-up email, say info@opensourceflare.com, to trick someone. This is called email spoofing with fake headers as follow:

Date: Thu, 24 Oct 2021 12:46:10 From: nixCraft <info@opensourceflare.com> Reply-To: info@opensourceflare-email.com To: <my@personal_gmail_com>

Correct headers are often not checked by receiving email servers, and my@personal_gmail_com may think the email is from me. Here is the thing I don't use opensourceflare.com for email communication at all. So how do I prevent illegitimate email traffic on my domain? In this tutorial, I will explain how to configure DNS settings that tell receiving email servers this domain is not configured for emailing purposes and the attacker maliciously sending email on my behalf.

The post If your domain is not sending email, set these DNS settings to avoid spoofing and phishing appeared first on Opensource Flare✨.

This quick tutorial explains How to check the SHA1 hash of a file on Linux, FreeBSD, and Unix-like systems using the sha1sum or sha1 command.

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The post How to check SHA1 hash on Linux, FreeBSD and Unix appeared first on nixCraft.