Author image


133 posts
Researcher, blogger and international speaker. I'm the creator of and, free tools to help improve online security.

The Best TLS Training in the World - Coming up North

This year I've been working hard on delivering The Best TLS Training in the World both nationally and internationally. The course has been tremendously well received and consistently receives amazing feedback. Due to the high demand we're now expanding our offering outside of London and bringing a training course up…

Continue Reading

Email Security - DMARC

The last in the email security series, DMARC, or Domain-based Message Authentication, Reporting and Conformance, builds on both SPF and DKIM. Improving security further and allowing reporting, you can monitor your domain for fraudulent or spoofed emails to take action. DMARC As another DNS TXT record, DMARC is easy to…

Continue Reading updates and sponsorship

A couple of months ago I announced some updates to and the new sponsorship opportunities. 2 months on I've made some further updates on feedback and have a new sponsor to announce! Regular readers will be aware of my free service,, that analyses your…

Continue Reading

Email Security - DKIM

Domain Keys Identified Mail, or DKIM, is another security mechanism available to us that allows us to prevent spoofing or forging of emails from our domain. Using public key cryptography to assure the integrity and authenticity of emails, properly configured DKIM is an excellent protection. DKIM The DKIM RFC is…

Continue Reading

Email Security - SPF

Sender Policy Framework, or SPF, is a really simple mechanism that allows you to stop others being able to send spoofed emails from your domain. To enable SPF all you have to do is create a DNS record with the appropriate information. SPF You can read the RFC for SPF…

Continue Reading