Why it happens
Microsoft is switching off Basic Authentication for SMTP AUTH in Exchange Online by default at the end of December 2026. Anything that sends email with a plain username and password stops: multifunction printers and scanners, older website contact forms, line-of-business software and some CRMs. We find every device and app still relying on it and move each one to a supported way of sending before it breaks, or fix it fast if it already has.
We also sort the everyday Microsoft 365 problems that stop a small office working: accounts blocked for sending after a compromise, shared mailboxes that won't show up, Outlook profiles that won't open, licences in a muddle, and MFA set up in a way nobody can live with.
What we fix
550 5.7.708or 'Your message couldn't be delivered'We check whether the tenant has been flagged for spam or a compromised account, clean it up and work with Microsoft to lift the restriction.
- Scanner or printer can't email any more
We move it to an authenticated method that still works after SMTP AUTH is switched off, or set up a connector for it.
- Website forms stop sending through Microsoft 365
We switch the site to modern authentication (OAuth) or a proper sending service, and test it end to end.
- Outlook keeps asking for a password or won't sync
We repair the profile, clear stale credentials and check conditional access and MFA so it stays fixed.
- A mailbox has been hacked
We lock the account, remove forwarding rules and rogue app consents, check sign-in logs and secure every account in the tenant.
- Licences, shared mailboxes and permissions in a mess
We tidy the tenant so people have what they need, and you stop paying for licences nobody uses.
The qualifications behind the fix
Microsoft MVP and Microsoft 365 partner, AWS Solutions Architect, WordPress certified, Apple developer, Google IT Support and UniFi partner. One UK team for websites, email, apps and networks.
Microsoft MVP
Microsoft's award for independent experts, given for deep technical knowledge and work with the community.
Microsoft 365 partner
Business email, Teams, SharePoint and security, set up and fixed by a Microsoft partner.
AWS Solutions Architect
Certified to design and run hosting on Amazon Web Services, from a single site to a whole platform.
WordPress certified
WordPress and WooCommerce sites built, repaired and kept up to date by certified developers.
Apple developer
Google IT Support certified
UniFi partner
Is the SMTP AUTH change going to affect me?
If anything in your office sends email using a username and password over SMTP (a scanner, a website form, an old app), probably yes. We can check your tenant's sign-in logs and tell you exactly what will stop.
Are you really a Microsoft partner?
Yes. We're a Microsoft 365 partner and the team includes a Microsoft MVP, an award Microsoft gives to independent experts for their technical work and community contribution.
Can you work remotely?
Almost all Microsoft 365 work is done remotely through the admin centre with your permission. If something needs hands on a device, we'll say so and arrange it.
Do you offer ongoing Microsoft 365 support?
Yes, as a monthly arrangement or as fractional IT, where we act as your IT department for a set number of days.
Related fixes
Guides on this
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- Called the same dayA UK engineer rings you at the time you picked.
- Diagnosed and quotedWe find the cause and tell you the price before any work starts.
- Fixed and verifiedWe test it with you, explain what we changed and stand behind the fix.
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