Nexus Open Systems Ltd

Nexus Managed Email Security Services

Nexus partner with the best of breed in Cloud Security to deliver a fully Managed Email Security Service. This gives you a critical defence to protect against advanced threats and data loss. With our comprehensive enterprise-grade email protection, you and your organisation can breathe easier.


  • Advanced Threat protection for your organisation
  • Anti-Phishing protection for your users
  • AI for Real-Time Spear Phishing & Cyber Fraud Defence
  • Malware Protection & Spam Filtering
  • Link Protection & Typosquatting protection
  • Block Email-Borne Viruses
  • Denial of Service (DOS) Attack Prevention
  • Secure Communication with Email Encryption
  • Data Leak Protection
  • Ongoing 8-6 Support


  • Complete, simple and affordable protection for business emails
  • Award winning email security with tamper proof email archives
  • Powered by global 24x7 threat operations centre
  • Scalable cloud and prioritised filtering technology
  • 100% cloud based, no hardware or software or updates
  • Spam and multi layered malware protection
  • Simple per user cost model
  • No set up or upfront costs
  • No hardware or software to buy or maintain
  • Multi-layered security services help with GDPR compliance


£3 a user a month

  • Education pricing available
  • Free trial available

Service documents

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G-Cloud 13

Service ID

9 2 7 2 3 4 6 6 6 8 0 8 2 0 5


Nexus Open Systems Ltd Stuart Wilson
Telephone: 01392 205095

Service scope

Software add-on or extension
Cloud deployment model
  • Public cloud
  • Private cloud
  • Hybrid cloud
Service constraints
Our service is designed based upon the end users environment including the size of their organisation and internet connection to ensure the service can operate optimally.

Onsite consultancy is required to implement the service based upon the end users specific requirements and security policies.
System requirements
Use Office 365, Gmail or Exchange email solutions

User support

Email or online ticketing support
Email or online ticketing
Support response times
Standard SLA is for 2 hours response for Critical issues; 4 hours response for Major issues and 8 hours response for Minor issues.
User can manage status and priority of support tickets
Online ticketing support accessibility
None or don’t know
Phone support
Phone support availability
9 to 5 (UK time), Monday to Friday
Web chat support
Web chat
Web chat support availability
9 to 5 (UK time), Monday to Friday
Web chat support accessibility standard
None or don’t know
How the web chat support is accessible
Users can interact with our Technical, Sales and Training teams. Raising questions which are dealt with there and then. Alternatively we will take enquiries away and respond direct to users through email.
Web chat accessibility testing
None as yet
Onsite support
Yes, at extra cost
Support levels
Pricing: No Set-up Costs; No Annual Upgrade or Re-licencing Costs; Simple Pricing Model - Support: Ongoing 8-6 Support; Email-borne Virus Protection; Spam Protection; Email Based Malware Protection; Advanced Threat Detection - Dedicated Account Manager
Support available to third parties

Onboarding and offboarding

Getting started
We follow a defined process for on-boarding new clients to ensure that they have the assurance of our help, whilst at the same time remain in control of the cloud services which are often at the core of their business. Through the on-boarding process Nexus will complete a detailed assessment of: • Client’s strategic vision • Organisational culture • Current and future objectives • Desire business outcomes • Potential improvements to existing business processes • Project and programme delivery resources • Current governance and programmes. We can provide onsite training to our clients as well as instruction at our own training centre. User documentation is provided by way of client portal guide
Service documentation
End-of-contract data extraction
The customer can extract their data in PST format, which is something that the professional services team will assist with, during the contract expiry period.
End-of-contract process
Should the customer decide not to renew the contract once the initial agreement has ended our in-house professional services team will assist the customer redirect their MX records and retrieve their data OR assist the new supplier in extracting the data into the new solution. This is included in the overall price of the solution as a remote service.

Using the service

Web browser interface
Supported browsers
  • Internet Explorer 11
  • Microsoft Edge
  • Firefox
  • Chrome
  • Safari
Application to install
Designed for use on mobile devices
Service interface
User support accessibility
WCAG 2.1 A
Description of service interface
Application client and web browser
Accessibility standards
WCAG 2.1 A
Accessibility testing
Barracuda strives to make products that are accessible to users with disabilities.
Customisation available
Description of customisation
Users can customise the user interface to enable the real-time reporting element to be more effective. There are also many elements in the solution which can be customised, including Spam Scoring, Quarantine and Attachment analysis


Independence of resources
The service is designed as a global resource and has therefore been designed to accommodate a significant number of users. As a fully cloud based application the resource at the infrastructure level has been created by Barracuda and does not have any restrictions on individual users.


Service usage metrics
Metrics types
Users on the system
Spam & Virus email results (How many blocked)
Reporting types
  • Real-time dashboards
  • Regular reports
  • Reports on request


Supplier type
Reseller providing extra support
Organisation whose services are being resold

Staff security

Staff security clearance
Conforms to BS7858:2019
Government security clearance
Up to Security Clearance (SC)

Asset protection

Knowledge of data storage and processing locations
Data storage and processing locations
  • United Kingdom
  • European Economic Area (EEA)
  • Other locations
User control over data storage and processing locations
Datacentre security standards
Supplier-defined controls
Penetration testing frequency
At least every 6 months
Penetration testing approach
‘IT Health Check’ performed by a Tigerscheme qualified provider or a CREST-approved service provider
Protecting data at rest
  • Physical access control, complying with CSA CCM v3.0
  • Physical access control, complying with SSAE-16 / ISAE 3402
  • Physical access control, complying with another standard
  • Encryption of all physical media
Data sanitisation process
Equipment disposal approach
A third-party destruction service

Data importing and exporting

Data export approach
If required this would be through the .pst format
Data export formats
Other data export formats
.pst file
Data import formats
Other data import formats
.pst file

Data-in-transit protection

Data protection between buyer and supplier networks
TLS (version 1.2 or above)
Data protection within supplier network
TLS (version 1.2 or above)

Availability and resilience

Guaranteed availability
Barracuda do not offer SLA's on any solutions
Approach to resilience
Barracuda use a dual data centre configuration, with internal built in resilience in both data centres.
The data centre includes the latest in data centre technology, benefitting from Rittal cold aisle containment pods, advanced building management systems, carrier grade Cisco ASR9000 routers and Cisco Nexus 7000 switches, Riello/Perkins generators (N+1) and Weatherite BTR45EC air handling units. Our systems monitor over 200 metrics - everything you'd expect from a next generation data centre and much more.
Outage reporting
Through the customers user interface, Barracuda online campus and also via email.

Identity and authentication

User authentication needed
User authentication
  • 2-factor authentication
  • Username or password
Access restrictions in management interfaces and support channels
Access management controls are available through the portal with admin users enabling additional controls for other areas. As the service will only need to be accessed by the IT Admin team there is less of a requirment to give end users access.
Access restriction testing frequency
At least every 6 months
Management access authentication
  • 2-factor authentication
  • Username or password

Audit information for users

Access to user activity audit information
Users have access to real-time audit information
How long user audit data is stored for
At least 12 months
Access to supplier activity audit information
Users have access to real-time audit information
How long supplier audit data is stored for
At least 12 months
How long system logs are stored for
At least 12 months

Standards and certifications

ISO/IEC 27001 certification
Who accredited the ISO/IEC 27001
ISO/IEC 27001 accreditation date
What the ISO/IEC 27001 doesn’t cover
Our ISO 27001 certification relates to the information security management system and not to the products or services of our organisation. The certificate reference number, the mark of the Certification Body and/or the accreditation mark may not be shown on products or stated in documents regarding products or services.
ISO 28000:2007 certification
CSA STAR certification
PCI certification
Cyber essentials
Cyber essentials plus
Other security certifications

Security governance

Named board-level person responsible for service security
Security governance certified
Security governance standards
ISO/IEC 27001
Information security policies and processes
Barracuda uses a defense-in-depth strategy and proprietary hardened software and operating systems to protect data and services. Barracuda conducts regular inspections to ensure the security of its systems.

Operational security

Configuration and change management standard
Supplier-defined controls
Configuration and change management approach
Available upon request
Vulnerability management type
Supplier-defined controls
Vulnerability management approach
Available upon request
Protective monitoring type
Supplier-defined controls
Protective monitoring approach
Available upon request
Incident management type
Supplier-defined controls
Incident management approach
Available upon request

Secure development

Approach to secure software development best practice
Supplier-defined process

Public sector networks

Connection to public sector networks

Social Value

Fighting climate change

Fighting climate change

The environmental benefits of our G-Cloud Service provision are substantiated by Microsoft’s own studies and commitments towards climate change.
A 2018 study found that using the cloud platforms can be up to 93% more energy efficient and up to 98% more carbon efficient than on-premises solutions.

Real sustainability requires solutions that address wastefulness at every level of a business. Hosting on the cloud is more environmentally friendly and results in less of a carbon footprint.
Cloud infrastructures support environmental proactivity, powering virtual services rather than physical products and hardware, and cutting down on paper waste, improving energy efficiency, and (given that it allows employees access from anywhere with an internet connection) reducing commuter-related emissions. Independent reports predict that data centre energy consumption would drop by 31% from based on the adoption of cloud computing and other virtual data options.


The primary benefits of Microsoft's cloud services are the transfer of ownership of compliance and maintenance of cloud infrastructure and its security and that IT Managers and business owners no longer need to be concerned about those elements of their IT systems once in a Microsoft cloud platform. This has a massive positive impact on wellbeing of employees within organisations across the world.


£3 a user a month
Discount for educational organisations
Free trial available
Description of free trial
Barracuda offer free of charge 30 days evaluations for unlimited users

Service documents

Request an accessible format
If you use assistive technology (such as a screen reader) and need versions of these documents in a more accessible format, email the supplier at Tell them what format you need. It will help if you say what assistive technology you use.