Managed protection from email-based threats

Adaptive email security that combines best-in-class effectiveness with unprecedented visibility and control.

Email Security

Modern email threats are smart - so we use Sublime Security to catch them with something even smarter.

Email is still the number one way attackers try to sneak into your business. And unfortunately, most legacy email security tools just aren’t keeping up. That’s where we come in. Using Sublime Security’s open and flexible detection engine with natural language recogition, artificial intelligence and machine learning, we block phishing, business email compromise, and zero-day attacks before they hit the inbox - no matter where they’re coming from.

We manage everything behind the scenes, constantly tuning and improving detections, even customising detection rules for our customers based on what’s targeting your business. No guesswork. No outdated rules. Just better protection, delivered with the insight and care you'd expect from a human-led security team.

Advanced phishing, business email compromise, and malware protection that evolves with the threat landscape.

Customisable detection logic, tailored to your business and risk profile
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What you get:

Fast deployment that works seamlessly with Microsoft 365 and Google Workspace
Ongoing tuning and improvement by our expert security engineers
Visibility into email attack trends and outcomes - not just blocked messages
Open, transparent security that puts you in control (no black-box AI)
Integration with your wider security stack (MDR, SIEM, SOAR) for smarter response

Service detail

Email protection, reimagined for modern threats

Our managed email security service, powered by Sublime Security, delivers modern, adaptive protection against phishing, business email compromise (BEC), and emerging social engineering attacks. Unlike legacy email gateways that rely on static rules and known threats, Sublime uses behavioural and contextual analysis to detect suspicious patterns in real time - across message content, sender behaviour, language cues, and technical headers. It integrates natively with Microsoft 365 to inspect inbound, outbound, and internal emails without disrupting delivery or user experience. Our security analysts continuously adapt detection logic to your organisation’s evolving risk profile, incorporating threat intelligence and real-world attack scenarios. We provide clear reporting, human-led investigation, and actionable recommendations so your team stays informed but never overwhelmed. With Bastion and Sublime, you get the power of behavioural email detection, delivered as a fully managed and expert-led service.

Advanced Detection, Analyst-Led Response

Modern email threats need more than static rules

This is email protection designed for today’s threats - fast-moving, sophisticated and often personalised. Our team works alongside Sublime’s platform to deliver threat detection that’s not just smarter, but more aligned with your real-world risks.

Detects behavioural anomalies in real time, not just known threats
Analyst-led triage and contextual investigation
Clear, actionable reporting and remediation advice

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Our delivery process

How we deliver Managed Email Security with Sublime

Our managed email security service, powered by Sublime Security, provides behavioural-based protection that goes beyond traditional rule-based filters. By sitting after your existing email gateway or Microsoft 365, Sublime analyses the full context of every message - content, headers, sender patterns and behavioural signals - to detect phishing, BEC and emerging threats in real time. We take care of everything: deployment, detection tuning, false positive handling and threat analysis. Our analysts write and maintain custom detections tailored to your threat landscape, so you don’t have to. With Bastion managing your email security, you’ll always have human-led context behind alerts, regular reporting and a clear escalation path when something suspicious hits your inbox.

Deploy and integrate

We configure Sublime to work seamlessly with Microsoft 365 or your existing gateway - no disruption

Tune and tailor detections

Our team creates custom detection logic based on your environment, risk profile and threat trends.

Monitor, report and escalate

We continuously monitor for threats, investigate alerts and provide clear reports with actionable recommendations when action is needed.

Benefits

Why choose Bastion for Managed Email Security Services

At Bastion, we deliver email security that actually adapts to the way attackers operate today—not how they did five years ago.

One secure partner

We manage the entire email security lifecycle - from deployment to detection tuning - so you can focus on business, not blockers.

Built for today’s threats

We block phishing, BEC and emerging attacks that bypass traditional tools, using behavioural signals and contextual analysis.

People you can call

You get direct access to analysts who investigate alerts and give you real answers, not just a dashboard full of noise.

What comes next

Expand your security coverage

We don’t just stop at email - we help you mature your broader security posture. From detection response to cloud security, we’ve got your back.

Review and refine detection logic across other key systems
Extend protection to cloud apps, endpoints and identity
Get expert-led advice on what to prioritise next

Talk to an expert

Executive and Board Security Governance Training

We train executives and boards on their cybersecurity oversight role — focusing on risk framing, accountability, and key governance responsibilities.

Instructor Led ISO27001 Training

This instructor-led course equips participants with the knowledge and skills needed to become certified to lead, plan, and conduct ISO 27001 audits.

Frequently asked questions

From risk assessment to rapid response - we’re with you every step of the way.

How does Bastion’s email security stop phishing and business email compromise?

We use advanced detection powered by Sublime Security to stop phishing, spoofing, and business email compromise before it hits the inbox. Our system learns from threat behaviour, not just static rules, to catch what others miss.

What makes this service different from traditional email gateways?

Unlike traditional email filters, our solution is dynamic and adaptive. It uses behaviour-based analysis, AI-driven detection, and real-time threat intelligence to block evolving email threats.

Will it work with Microsoft 365 or Google Workspace?

Yes. Our solution integrates natively with Microsoft 365 and Google Workspace, allowing fast deployment and seamless protection without disrupting your existing email workflows.

Can you customise detection rules for our business?

Absolutely. We fine-tune detections based on your organisation’s risk profile and evolving threat landscape. Our security engineers continuously adapt and improve the rules for better protection.

How does this service improve visibility and control?

You’ll get clear insight into email threats, detection outcomes, and response actions. Unlike black-box solutions, our platform provides transparent reporting and integrates with your broader security stack for streamlined response.