Sebastiaan, Author at InboxSys | Deliverability

Introducing the InboxSys BIMI checker

11 November 2025

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If you’re serious about email deliverability, you’ve probably heard about BIMI — short for Brand Indicators for Message Identification. But for many senders, it remains a technical mystery: What is BIMI really, and why does it matter?

Of Governments and Cybercriminals

28 January 2020

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Sebastiaan

Imagine being one of the richest people on the planet, and having your nude photographs stolen from your smartphone.

Authentication and alignment

3 January 2019

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Sebastiaan

SPF, DKIM, DMARC, alignment and ARC.

DMARC explained

7 August 2018

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Sebastiaan

Below is a short history of DMARC, giving some background into why this is important and how it works. But first, a little history…