Email Security
Stop phishing emails before your team ever sees them.
Advanced, AI-driven email security for SMEs across the UK, BVI and USA. We block phishing, ransomware and Business Email Compromise at the inbox — and harden your Microsoft 365 environment behind the scenes.
Delivered by the cyber security specialists at Fresh Mango Technologies.

What it is
Email Security, explained plainly.
Managed email security replaces or augments your default Microsoft 365 / Google Workspace protection with AI that inspects every message, attachment and link for malicious intent — and our UK team that tunes the rules and responds to incidents on your behalf.
Why it matters
The business risk if you don't act.
Nine out of ten successful cyber attacks start with a phishing email. Default Microsoft 365 protection misses a meaningful percentage of modern attacks, and SMEs rarely have the time to configure it properly.
Phishing is the entry point for 90%+ of SME breaches
Business Email Compromise costs businesses millions every year
Default Microsoft 365 settings let known threats through
Insurers increasingly require advanced email protection
What's included
Everything you need, in one service.
- AI-driven phishing, ransomware and BEC protection
- Impersonation and brand spoofing defence
- Attachment sandboxing and safe-link rewriting
- Microsoft 365 / Google Workspace hardening
- Quarantine release workflow for your team
- Monthly threat reports in plain English
How it works
A simple, proven process.
- 1
Connect
We connect the email security platform to your Microsoft 365 or Google Workspace tenant in under an hour.
- 2
Harden
We audit and lock down your tenant settings — MFA, conditional access, anti-phishing policies and audit logging.
- 3
Protect
Every inbound and outbound email is inspected by AI; suspicious messages are quarantined automatically.
- 4
Respond
Our UK SOC investigates flagged messages, releases false positives and reports on threat trends each month.
Who it's for
Built for SMEs in the UK, BVI & USA.
Any SME across the UK, BVI and USA running on Microsoft 365 or Google Workspace — especially those handling client funds, sensitive data or supplier payments.
- Professional services, legal and accountancy firms
- Finance, payroll and bookkeeping teams
- Any business processing customer or supplier payments
- Companies whose insurer requires advanced email security
Investment
From £4 per mailbox, per month
Simple per-mailbox subscription. Includes the email security platform, Microsoft 365 hardening and ongoing UK SOC monitoring — no minimum contract.
FAQ
Common questions about Email Security.
What is managed email security?
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Managed email security is an AI-driven layer that inspects every inbound and outbound message, attachment and link for phishing, ransomware and impersonation attempts, backed by our UK team who tune the rules and investigate anything suspicious. It sits in front of Microsoft 365 or Google Workspace to catch what default settings miss.
How does email security actually stop phishing and impersonation?
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AI scans every message for known malicious patterns and unusual behaviour such as look-alike domains or CEO impersonation, sandboxes attachments before delivery, and rewrites links so they're checked at the moment someone clicks. Suspicious messages are quarantined automatically, and our UK SOC investigates flagged emails and releases genuine false positives quickly.
Why should we add this on top of Microsoft 365's built-in protection?
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Nine out of ten successful cyber attacks start with a phishing email, and default Microsoft 365 settings let a meaningful proportion of modern threats through because most SMEs don't have time to configure every anti-phishing and conditional access policy correctly. This service closes that gap and hardens your tenant properly, rather than leaving you on default settings.
What does email security cost?
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Pricing starts from around £4 per mailbox per month on a simple subscription with no minimum contract, covering the platform, Microsoft 365 or Google Workspace hardening and ongoing UK SOC monitoring in one fee. We confirm exact pricing once we know your mailbox count and platform. There are no setup fees and no long tie-in, so you can trial it against real mail flow and judge it on results. For most SMEs the monthly cost is considerably less than the value of a single fraudulent supplier payment.
Is this suitable for a small business, or is it aimed at larger companies?
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It's suitable for any SME on Microsoft 365 or Google Workspace, particularly those handling client funds, sensitive data or supplier payments where a single successful impersonation email could be costly. Setup takes under an hour, so there's no lengthy project required to get protected. Professional services firms, charities and businesses handling client money see the strongest benefit, because invoice fraud and CEO impersonation target exactly those payment processes. It works alongside whatever email platform and filtering you already have rather than replacing it.
How does this compare with just training staff to spot phishing?
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Staff training reduces risk but doesn't stop a well-crafted email reaching the inbox in the first place; email security stops the vast majority of malicious messages before anyone has the chance to click. Most clients run both together — the technical filter as the first line of defence, and training such as our Phishing Simulation as the backstop.
Will genuine business emails get wrongly blocked?
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False positives are extremely rare and easy to release through the quarantine workflow. Our SOC continuously tunes the rules to your specific business and suppliers, so legitimate mail flow shouldn't be meaningfully affected once the service beds in. During the first two weeks we run in a monitoring-heavy mode and review quarantine decisions with you, so the rules are calibrated to your real suppliers and clients before enforcement tightens. Users can also release their own low-risk quarantined mail without raising a ticket.
Can you help with ongoing support if something looks suspicious after setup?
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Yes. Our UK SOC investigates flagged messages, releases genuine false positives, and provides monthly threat reports in plain English, so you have ongoing support rather than a one-off configuration with no one watching afterwards. If a member of staff forwards a suspicious message, our analysts will confirm whether it is malicious, check whether anyone else received it, and tell you what action to take. That means your team always has somewhere to send the email they are unsure about.
Before you buy
Costs, risks and misconceptions.
The questions buyers actually ask about Email Security — what it costs to budget for, what happens if you do nothing, and the assumptions that most often turn out to be wrong.
What does email security cost once we include domain configuration work?
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The filtering service itself is licensed per mailbox per month. The one-off element people miss is authentication: getting SPF, DKIM and DMARC configured correctly, which is a small piece of consultancy work rather than a licence cost, and only needs doing once. We quote both up front. There is no per-message charge and no additional cost for the quarantine, reporting or release workflow.
What actually happens if a business email compromise attack succeeds?
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The typical pattern is that an attacker gains access to a mailbox, watches quietly for weeks, then sends a genuine-looking message from a real internal address asking for bank details to be changed. Payments go to the attacker, and because the email came from a legitimate account, filters and staff both see nothing unusual. Recovery involves recalling funds — often unsuccessfully — forensics on the mailbox, notifying affected clients, and a possible reportable data breach if the mailbox held personal data.
Does having SPF, DKIM and DMARC mean nobody can impersonate us?
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They stop someone sending mail that claims to come from your exact domain, which is a real and worthwhile protection. They do not stop lookalike domains — a character swapped, a hyphen added, or a different suffix — which is how most impersonation attacks are actually run. They also do nothing about mail sent from a genuine account an attacker has compromised. They are necessary and insufficient, which is why filtering and staff awareness sit alongside them.
Won't a filtering service hold up legitimate business mail?
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Some quarantining is unavoidable if you want meaningful protection, but it should be visible and quick to resolve. Users receive a digest of held messages and can release routine items themselves, and a named contact can allow-list a supplier permanently. We tune the policy during the first few weeks based on your actual mail flow rather than leaving default thresholds in place, which is when most false-positive complaints occur.
Who manages the quarantine and the day-to-day releases?
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That is your choice and it is agreed at setup. Most SMEs let users manage their own digests, with an internal contact handling anything unclear and escalating to us. Alternatively we manage it as part of a managed service, reviewing held items and acting on release requests. What we do not recommend is nobody owning it, which is how a critical quarantined message sits unnoticed for a week.
Can this run on top of Microsoft 365 without breaking anything?
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Yes. It is added in front of or alongside your existing Microsoft 365 mail flow using standard connectors and DNS changes, and it does not replace your mailboxes, calendars or Teams. The change is made outside working hours with a documented rollback, and we monitor mail flow closely immediately afterwards. Your users keep using Outlook exactly as they do now.
Explore related cyber security services
Most SMEs combine email security with a wider set of managed controls. Here's where to look next.
Next step
Cyber Shield — ongoing protection
Monthly subscription that keeps your team cyber-aware all year. 14-day free trial, cancel anytime.
Cyber Essentials (CE Accreditation)
Get certified, win tenders and lower your insurance.
EDR / MDR
Endpoint detection and managed response that stops ransomware before it spreads.
Start here
Book a free cyber security review
30 minutes with a UK specialist — a plain-English view of your risks and next steps.
Related case studies
All case studiesProfessional Services · Harrogate, North Yorkshire
Harrogate accountancy practice cuts phishing click rate from 31% to 4%
31% → 4%
Phishing click rate over six months
Education · West Yorkshire
Multi-academy trust hardens Microsoft 365 and blocks 1,400 malicious sign-ins a month
~1,400
Malicious sign-in attempts blocked per month
Retail · Ripon, North Yorkshire
North Yorkshire retailer stops a £48,000 invoice fraud attempt
£48,000
Single fraudulent payment prevented
Understand the concepts behind Email Security
Plain-English reference pages in our Knowledge Centre that explain the terms used on this page.
Where we deliver Email Security
We support SMEs across Yorkshire, the wider UK, the British Virgin Islands and the US. These pages cover the areas where we work on site.
Who delivers this work
Complete Cyber Security is part of Fresh Mango Technologies, with offices in the UK and BVI.
Two ways to get started
Not sure what you need? Speak to us. Want ongoing protection? Try it free.
Book a free 30-minute Cyber Security Review with our UK team, or start a 14-day free trial of Cyber Shield and see the difference for yourself.

