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SPF, DKIM and DMARC explained, and how to get to reject safely
What SPF, DKIM and DMARC do, why Gmail, Yahoo and Outlook now insist on them, and a safe path to a DMARC reject policy in Microsoft 365.

The platforms your people work in every day, implemented and managed as one environment. We handle migration, licensing and day-to-day running, and build custom software where off-the-shelf tools fall short.
Based on our initial contact with you about your operations.
We review your current system and how Geidi may be able to enhance your IT operations.
If there is a fit, we work with you to identify a low-risk first step.
Geidi gave us some very sound advice at the early stages of our SharePoint project. The scope of what we wanted to do was pretty big and our thoughts and ideas were limitless. The guidance that Geidi gave during that crucial period helped put a framework around our SharePoint project and we now understand the value of the advice they provided since implementation. If your business is looking to move to the cloud or just looking at a better way of dealing with its IT infrastructure, we would recommend contacting Geidi to get a handle on what you want to achieve.
We work with organisations of 5 to 1,000 staff, Perth-based and Australia wide, across mining, finance, legal, engineering, architecture, real estate, media, medical, education, communications, government-funded, non-profit.
Our approach is process-first. We start by understanding how your company's processes actually run, then choose the technology to support them. We work with organisations of 5 to 1,000 staff, Perth-based and Australia wide. A staged method with review gates and support. Risk is managed at every stage.
Based on our initial contact with you about your operations, we listen, analyse and review your needs. If there is a fit, we then work with you to identify a low-risk first step to begin our journey with you.
5 min read
What SPF, DKIM and DMARC do, why Gmail, Yahoo and Outlook now insist on them, and a safe path to a DMARC reject policy in Microsoft 365.

7 min read
Business Basic, Standard, Premium or E3? A plain-English guide to Microsoft 365 licences in 2026, where Copilot fits, and the mistakes that waste money.
The support, security, cloud and infrastructure your business relies on, run by an experienced team for organisations of 5 to 1,000 staff. Perth-based, Australia wide.
See managed it overviewA 7-day service desk with unlimited incident and onsite support, plus fixed-cost coverage of the servers, networks and remote access your business depends on.
Explore Managed IT & SupportA 24/7 security operations centre with monitoring, detection and response, aligned to Essential Eight and NIST.
Explore Cyber SecurityGeidi AI, our newest division. Practical AI and automation, built safely on the Microsoft 365 environments and security we already manage.
Explore AI & AutomationGeidi AI, in production
Add or remove a staff member in one step: account, licence, laptop and welcome email, even scheduled for their start date. Geidi estimates about 40 minutes saved per new starter.
IT Portal on geidi.aiGeidi AI, in production
Describe a tool in plain English and get a properly set-up software project in minutes, with the rules built in from day one.
Endgame on geidi.aiGeidi AI, in production
One place that knows every system you run, what it does, and what a change will break.
Geidi Project Registry on geidi.aiTell us about your existing IT. We would be pleased to review your current system and give you an overview as to how Geidi may be able to deliver and enhance your IT operations.