Email security for small UK businesses that rely on Microsoft 365
If your business runs on Outlook, Teams, SharePoint and OneDrive, email security cannot stop at basic spam filtering. We help you reduce phishing, protect your domain, monitor Microsoft 365 risks, detect account compromise and recover business-critical data when something goes wrong.
What is the best email security solution for a small UK business?
The best email security solution for a small UK business is rarely one single product. It is a layered approach that reduces phishing, protects your domain, tightens Microsoft 365 security settings, detects account compromise and gives you a way to recover if something slips through.
Black Swan Cyber Security Solutions helps small businesses, schools and local organisations improve business email protection across Microsoft 365, Google Workspace and cloud backup without making cyber security frightening, overcomplicated or enterprise-priced.
Useful if you are asking
- How do I stop phishing emails reaching my staff?
- What is the best anti phishing small business setup?
- Do we need extra protection for Microsoft 365?
- What does good business email protection in the UK look like?
The short answer
For most small UK businesses, the best email security solution is a layered stack: Avanan for phishing, malware and spam protection, Sendmarc for DMARC and domain protection, Octiga or Huntress Managed ISPM for Microsoft 365 security settings, Huntress ITDR for identity threat detection, and cloud backup from Axcient, ConnectWise or Redstor so you can recover if email or cloud data is deleted, altered or compromised.
Why small business email security needs more than spam filtering
Traditional spam filtering is no longer enough. Modern email attacks are designed to look normal. They may come from a real supplier, a compromised account, a familiar cloud service, a fake Microsoft 365 login page or a spoofed version of your own domain.
Email security is not just about stopping bad emails. It is about protecting the inbox, the identity behind the inbox, the domain the email comes from, the settings inside Microsoft 365 and the data the business needs to recover.
How do I stop phishing emails reaching my staff?
You cannot stop every phishing email, but you can stop more of them reaching staff and reduce the damage if one gets through. The aim is not to rely on people spotting every threat. The aim is to build layers around them.
Improve inbox protection
Add stronger email security to detect phishing, malware, spam, impersonation, malicious links and unsafe attachments before they land in the inbox.
Protect the domain
Use DMARC, SPF and DKIM to reduce the chance of criminals sending emails that pretend to come from your business domain.
Watch for account misuse
Monitor for suspicious logins, malicious inbox rules, impossible travel, unusual forwarding and other signs of account compromise.
The layered email security stack we recommend
The right mix depends on your size, sector, budget and current Microsoft 365 or Google Workspace setup. For many UK SMEs, this is the practical layered approach we recommend.
Avanan email security
Helps protect Microsoft 365 and Google Workspace from phishing, malware, spam, malicious links, unsafe attachments and fake sender attacks.
- Anti phishing protection
- Malware and attachment scanning
- Link and impersonation protection
Sendmarc DMARC protection
Helps protect your domain from spoofing by making DMARC, SPF and DKIM easier to configure, monitor and move towards enforcement.
- DMARC reporting and monitoring
- SPF and DKIM alignment support
- Helps protect brand trust
Octiga or Huntress Managed ISPM
Helps find risky Microsoft 365 security settings, MFA gaps, admin issues, configuration drift and identity misconfigurations.
- Microsoft 365 posture checks
- Risky settings and drift visibility
- Practical hardening guidance
Huntress ITDR
Helps detect suspicious Microsoft 365 account activity, identity threats, malicious mailbox rules and signs that a user account is being misused.
- Suspicious login monitoring
- Identity threat detection
- Mailbox rule and account misuse visibility
Microsoft 365 cloud backup
Axcient, ConnectWise and Redstor provide recovery options if emails, files, SharePoint, OneDrive or Teams data are deleted, altered or compromised.
- Exchange, OneDrive, SharePoint and Teams backup
- Protection from deletion and compromise
- Clearer recovery routes
What are the biggest email security risks for small businesses?
The biggest risks are usually not exotic. They are everyday gaps that attackers know how to exploit. That is why small business email security needs to be practical, not just expensive.
Phishing and fake login pages
Staff are tricked into entering Microsoft 365, Google or banking credentials into a convincing fake page.
Business email compromise
Attackers use a real mailbox to monitor conversations, change payment details, send fake invoices or impersonate senior staff.
Domain spoofing
Criminals send email that appears to come from your domain, damaging trust and increasing the chance of fraud.
Risky Microsoft 365 settings
Weak MFA coverage, too many admins, guest access issues, legacy settings and policy drift can leave avoidable gaps.
Malicious attachments and links
Attackers use documents, PDFs, QR codes, cloud sharing links and fake file notifications to bypass user suspicion.
No recovery plan
If email or cloud files are deleted, encrypted, altered or lost, the business may not have a clean backup to restore from.
What good business email protection looks like for a UK SME
A good email security setup should be proportionate. A five-person business does not need the same setup as a bank, but it still needs sensible protection around the systems it relies on every day.
Minimum sensible controls
- Strong email filtering for phishing, malware, spam and impersonation
- MFA on all user accounts, especially Microsoft 365 and admin accounts
- DMARC, SPF and DKIM configured and monitored
- Microsoft 365 security settings reviewed regularly
- Cloud backup for business-critical mail and files
- A simple way for staff to report suspicious emails
Better protection as risk increases
- Identity threat detection for suspicious logins and mailbox activity
- Managed Microsoft 365 posture monitoring
- Conditional Access and tighter admin controls
- Security awareness training without blame or scare tactics
- Documented recovery steps for mailbox and cloud data incidents
- Regular review for cyber insurance and Cyber Essentials readiness
The best business email protection UK SMEs can put in place is not the most complicated stack. It is the stack they can understand, afford, maintain and recover from when something goes wrong.
Common mistakes we see with small business email security
These issues are common because they are easy to miss. They often build up quietly as a business grows, changes staff or adds new cloud services.
Assuming Microsoft defaults are enough
Microsoft 365 has strong features, but default settings are not the same as a properly reviewed and hardened environment.
Turning on MFA and stopping there
MFA matters, but it does not remove the need for monitoring, good admin hygiene, domain protection and backup.
Leaving DMARC at “none” forever
Monitoring is a useful start, but the aim should usually be to move carefully towards stronger enforcement.
Not checking mailbox rules
Malicious forwarding or inbox rules can let attackers hide emails, monitor conversations or divert important messages.
No separate Microsoft 365 backup
Retention and recycle bins are not the same as a dedicated backup and recovery plan for business-critical data.
Making staff the only defence
Training helps, but people should be supported by technology, clear reporting and sensible security controls.
How Black Swan helps
We help you choose and manage practical email security layers that fit your business. The goal is not to sell every tool to every client. The goal is to reduce your real risk in a way that makes sense for your size, budget and existing IT setup.
Review what you already have
We look at email protection, Microsoft 365 security settings, domain authentication, user access, backup and signs of configuration drift.
Prioritise the biggest gaps
We focus on the changes that reduce the most risk first, such as MFA gaps, weak domain protection, poor inbox filtering or missing backup.
Add the right layers
We help implement and support the right combination of Avanan, Sendmarc, Octiga, Huntress and Microsoft 365 backup where they fit.
Related services and pages
If you want to go deeper into one part of small business email security, these pages are a good next step.
Avanan email security
Email security and anti phishing protection for Microsoft 365 and Google Workspace.
Sendmarc DMARC protection
DMARC, SPF and DKIM support to help protect your domain from spoofing.
Octiga
Microsoft 365 security posture checks, risk visibility and configuration monitoring.
Huntress Managed ISPM
Managed Microsoft 365 posture monitoring for risky identity settings and drift.
Huntress ITDR
Identity threat detection and response for Microsoft 365 accounts and suspicious logins.
Microsoft 365 backup
Compare Axcient, ConnectWise and Redstor cloud backup options.
Microsoft 365 security
Secure Microsoft 365 settings, identity, backup and recovery for UK organisations.
Cyber Essentials
Get help with the core controls, including MFA, malware protection and secure configuration.
Frequently asked questions
What is the best email security solution for a small UK business?
The best email security solution for most small UK businesses is a layered approach. Use Avanan for phishing, malware and spam protection, Sendmarc for DMARC and domain protection, Octiga or Huntress Managed ISPM for Microsoft 365 security settings, Huntress ITDR for suspicious account activity, and cloud backup from Axcient, ConnectWise or Redstor for recovery.
What is anti phishing for small business?
Anti phishing for small business means using controls that reduce the chance of staff receiving, trusting or acting on phishing emails. This usually includes stronger email filtering, link and attachment protection, DMARC, MFA, identity monitoring, user training and a clear reporting process.
How do I stop phishing emails reaching my staff?
Start with stronger email security, such as Avanan, to detect phishing, malicious links, unsafe attachments and impersonation attempts. Add DMARC through Sendmarc to protect your domain, review Microsoft 365 security settings with Octiga or Huntress Managed ISPM, and monitor suspicious account activity with Huntress ITDR.
What is business email protection?
Business email protection is the combination of tools and processes used to protect email accounts, domains, users and data. It includes phishing protection, malware filtering, DMARC, MFA, identity monitoring, secure Microsoft 365 settings, staff awareness and backup.
Does Microsoft 365 need extra email security?
Microsoft 365 includes useful security features, but many small businesses still benefit from extra email security, posture monitoring and backup. The right setup depends on your licence level, configuration, risk, sector and whether your tenant is actively reviewed.
Do I need DMARC if I already use Microsoft 365?
Yes, in most cases. Microsoft 365 helps you send and receive email, but DMARC, SPF and DKIM help receiving mail systems understand whether email claiming to come from your domain is legitimate. Sendmarc can help make this easier to monitor and manage.
Does backup help with phishing?
Backup does not stop phishing emails arriving, but it helps with recovery. If an account compromise, deletion, ransomware incident or malicious action affects Microsoft 365 data, backup from Axcient, ConnectWise or Redstor can provide a clearer route back.
What is the best email security for a UK SME?
The best email security for a UK SME is usually a practical layered setup rather than a single product. It should include inbox protection, domain protection, Microsoft 365 security monitoring, identity threat detection, staff awareness and cloud backup.
Want to stop more phishing emails and protect your business inbox?
If you are not sure whether your email security, Microsoft 365 settings, DMARC and backup are strong enough, we can help you review the gaps and put a practical plan in place. No scare tactics. No jargon overload. Just sensible business email protection for UK SMEs.
Meet Kevin: Founder of Black Swan
Concerned about cyber security? Need advice or a tailor-made quote? Kevin is here to help you!
From actionable advice to helping you to see where you could be at risk, Kevin will help you to get your business on a path that is secure-by-design and ready for the unthinkable.
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