ARC isan email authentication system that preserves trust and integrity across intermediaries, ensuring legitimate emails are recognized even after multiple hops. It is an important setup for your email ecosystem!Β
Normal view
6 February 2026 at 14:37
What is ARC and why does it matter?
22 January 2026 at 12:45
30 seconds to DMARC
16 October 2025 at 14:20
What is MTA-STS and why does it matter
13 August 2025 at 11:29
The Critical Role of Local Intelligence in Email Security
7 July 2025 at 10:33
The day of DMARC being mandatory
23 April 2025 at 19:35
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Black Hills Information Security, Inc.

- Offensive SPF: How to Automate Anti-Phishing Reconnaissance Using Sender Policy Framework
Offensive SPF: How to Automate Anti-Phishing Reconnaissance Using Sender Policy Framework
28 June 2018 at 19:14
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Kent Ickler // TL;DR:Β This post describes the process of building an active system to automatically recon SPF violations. Disclaimer: There are parts of this build that might not be legal [β¦]
The post Offensive SPF: How to Automate Anti-Phishing Reconnaissance Using Sender Policy Framework appeared first on Black Hills Information Security, Inc..
How to Configure SPFv1: Explained for the Masses
29 May 2018 at 14:30
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Kent Ickler and Derrick Rauch* // Sun Protection Factor Errβ¦ wait a second. Sender Policy Framework Ladies and Gentlemen of the class of 1997, Wear Sunscreenβ¦I will dispense my advice, [β¦]
The post How to Configure SPFv1: Explained for the Masses appeared first on Black Hills Information Security, Inc..






