It is a scenario we are seeing across Winchester and the wider Hampshire area this month: you walk up to your trusty office scanner, pop in a stack of invoices, hit ‘Scan to Email’, and… nothing. Or perhaps you get a cryptic “Authentication Failed” or “Connection to Server Lost” error message.
If your scanner, multi-function device (MFD), or legacy business application has suddenly stopped sending emails, you haven’t necessarily done anything wrong. You are likely caught in the final waves of the Microsoft 365 SMTP shutdown. This significant event marks a critical point for many businesses relying on older systems.
As of March and April 2026, Microsoft has significantly accelerated the retirement of ‘Basic Authentication’ for SMTP (Simple Mail Transfer Protocol). While this move is a massive win for global cybersecurity, it is causing a bit of a headache for local businesses relying on older hardware. At BITSmart Technology Ltd, we believe in keeping your business running smoothly, so let’s dive into what is happening and, more importantly, how you can fix it.
Understanding the implications of the Microsoft 365 SMTP shutdown is crucial for planning your next steps.
Why has my scanner stopped working?
For years, scanners and old apps used ‘Basic Authentication’ to send emails. This essentially meant the device would store a username and a password and ‘log in’ to your Microsoft 365 account just like a person would.
The problem? Basic Authentication is inherently insecure. It doesn’t support Multi-Factor Authentication (MFA), making those credentials a prime target for hackers. If a cybercriminal gets hold of your scanner’s email password, they could potentially access your entire Microsoft 365 environment.
To protect users, Microsoft has been moving towards Modern Authentication (OAuth 2.0). While they have been talking about this for a long time, the “hard cutoff” for many tenants occurred recently, in the spring of 2026. If your device wasn’t updated or reconfigured, the connection has simply been severed.
The March/April 2026 Microsoft 365 Cutoff
You might be wondering why your scanner worked last week but doesn’t work today. Microsoft has been disabling Basic Auth in stages. While some organisations were transitioned earlier, a massive batch of UK-based tenants saw the final disablement of SMTP Basic Auth in March and April 2026.
Ultimately, the Microsoft 365 SMTP shutdown is a wake-up call for businesses to modernise their IT systems.
This is part of a broader effort to reduce the attack surface of cloud environments. If you are currently facing this issue, it is a sign that your IT infrastructure needs a quick “modernisation” boost. If you’ve recently undergone an Office 365 migration in Hampshire, you might have already addressed this, but legacy devices often slip through the cracks.
Failure to adapt to the Microsoft 365 SMTP shutdown can hinder your operational efficiency.
How to fix the “Scan to Email” failure
There are three primary ways to get your emails flowing again. The right choice depends on the age of your hardware and your specific business needs.
1. Switch to OAuth 2.0 (The Modern Way)
If your scanner was purchased in the last couple of years, there is a good chance it supports OAuth 2.0. This is the gold standard for security. Instead of storing a password, the device uses a secure “token” to communicate with Microsoft 365.
- How to do it: Access your scanner’s web interface (usually by typing its IP address into a browser). Look for the “Email” or “SMTP” settings. If you see an option for “Modern Auth” or “OAuth 2.0,” select it. You will likely need to follow a prompt to sign in via a web browser to “authorise” the device.
- Pro Tip: Always check for firmware updates first. Many manufacturers released updates specifically to add OAuth 2.0 support to older models.
2. Use a Dedicated Microsoft 365 SMTP Relay
If your device is a bit older and doesn’t support OAuth 2.0, you don’t necessarily need to throw it away. You can set up a Direct Send or an SMTP Relay using a “Connector” in your Microsoft 365 admin portal.
Utilising a Microsoft 365 SMTP relay can be an effective workaround during these transitions.
This method allows your device to send emails by identifying its “Public IP address” (the digital address of your Winchester office) rather than using a username and password.
- How to do it: Your IT partner will need to log into the Exchange Admin Center, create a “Connector” that allows mail from your specific IP address, and then configure your scanner to point to your specific MX endpoint (e.g., yourdomain-com.mail.protection.outlook.com).
- Note: This method usually only allows you to send emails to internal addresses (within your own company) unless you set up a full relay, which requires a bit more configuration.
3. Upgrade Your Hardware
Sometimes, the most cost-effective solution is to upgrade. If you are spending hours of billable time trying to coax a ten-year-old scanner into talking to a 2026 cloud environment, the “free” fix is actually costing you a fortune.
Embracing new technologies will prepare you for the challenges following the Microsoft 365 SMTP shutdown.
Modern MFDs are faster, more secure, and integrate directly with tools like Microsoft Teams and SharePoint. Upgrading your hardware ensures you keep your software updated to save your business from future compatibility shocks.
Why security matters for Winchester SMBs
With the Microsoft 365 SMTP shutdown, securing your email services is more important than ever.
It can be tempting to look for “workarounds” that keep Basic Auth alive, but we strongly advise against it. The National Cyber Security Centre (NCSC) consistently warns that identity-based attacks are the leading cause of data breaches in the UK. You can read more about their guidance on securing your email services here.
By moving away from Basic Auth, you are closing a massive door that hackers love to use. As a leading IT support company in Hampshire, we’ve seen how even a single compromised “service account” (like a scanner email) can lead to a full-scale ransomware event. Taking the time to fix this properly is an essential part of your business cybersecurity strategy.
The changes brought by the Microsoft 365 SMTP shutdown are significant and should not be underestimated.
Practical Troubleshooting Steps
Familiarity with the Microsoft 365 SMTP shutdown process will empower your IT decisions going forward.
Before you call for backup, try these quick checks:
- Verify the Port: Many older setups used Port 25. Microsoft 365 prefers Port 587 with STARTTLS encryption. Check if changing the port number fixes the handshake error.
- Check the License: Ensure the mailbox the scanner is trying to use actually has a valid license. You can compare different plans like Microsoft 365 Business Standard vs Premium to see which fits your needs.
- App Passwords (The “Old” Fix): If you have Multi-Factor Authentication enabled but are still trying to use Basic Auth, you might have been using “App Passwords.” Warning: Microsoft is also phasing these out. If your app password stopped working, it’s time to move to one of the methods mentioned above.
The Microsoft 365 SMTP shutdown impacts various aspects of email sending, including device compatibility.
How BITSmart Can Help
We understand that you just want your technology to work. You don’t want to spend your Tuesday afternoon reading technical manuals for a printer. That is where we come in.
We provide expert Microsoft 365 support in Winchester and across the county. We can:
Our team is well-versed in navigating the changes resulting from the Microsoft 365 SMTP shutdown.
- Audit your current devices to see which ones are at risk.
- Configure secure SMTP Relays so your legacy hardware keeps working safely.
- Update your global tenant settings to ensure you are compliant with the latest security standards.
- Provide a cybersecurity risk assessment to ensure there are no other “open doors” in your network.
Whether you are a small firm in the city centre or a larger operation in the Hampshire countryside, we make sure your IT supports your productivity rather than hindering it.
Transitioning smoothly past the Microsoft 365 SMTP shutdown will enhance your operational resilience.
Book a Call
Don’t let a “refusing to email” scanner slow down your workflow. If you are struggling with the Microsoft 365 SMTP shutdown, let’s get it sorted.
Book a Call with Tony and the team today
Summary: Future-Proofing Your Office
Addressing the implications of the Microsoft 365 SMTP shutdown now will save you trouble later.
The retirement of Basic Auth is a great example of why proactive IT management is vital. Technology doesn’t stand still; what was a “best practice” five years ago is a “security risk” today.
By addressing your scanner issues now, you aren’t just fixing a minor annoyance: you are hardening your business against modern threats. Whether it is through cloud collaboration tools or simply ensuring your printer can send an email, staying current is the best way to ensure your Hampshire business remains competitive and secure.
The Microsoft 365 SMTP shutdown exemplifies the need for proactive IT adaptation.
Remember, a quick fix might get you through the day, but a secure configuration will get you through the year. If you’re feeling overwhelmed by these changes, reach out to your local experts. We’re here to help you navigate the ever-changing landscape of Microsoft 365.
Don’t let the Microsoft 365 SMTP shutdown catch you off guard; stay informed and prepared.
