Secure Email Gateway
& Phishing Protection
Protect users, business communications and sensitive information from phishing, malicious attachments, malicious URLs, impersonation and evolving email-borne threats. Cylentrix designs and operates Secure Email Gateway and email security deployments that inspect every inbound and outbound message against your policy, so email threat protection and business email compromise defence work together instead of in isolation.
- Phishing Protection
- Malicious URL Analysis
- Attachment Inspection
- Impersonation & BEC
Inspect Every Message
Before It Reaches the Inbox
A Secure Email Gateway sits in the mail path and evaluates inbound and outbound traffic against configured security policies, so risky messages are handled before a user ever has to make a judgement call.
What is a Secure Email Gateway? It is an email security control that inspects messages entering and leaving the organisation. Sender and domain characteristics, reputation, message content, embedded URLs and attachments are each evaluated, and the resulting decision is to deliver, quarantine or block. Exact capabilities depend on the email-security platform selected and how it is configured for your environment.
What the gateway protects against. Phishing, impersonation, malicious URLs, malicious attachments and business email compromise are evaluated together rather than as separate products, so a message that looks clean on one signal is still assessed on the rest.
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Phishing Protection
Suspicious message patterns, sender reputation and threat intelligence are weighed together to identify deceptive email.
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Impersonation & Domain Spoofing
SPF, DKIM and DMARC results, lookalike domains and display-name mismatches help expose messages posing as trusted identities.
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Malicious URL Protection
Links are checked for reputation and unsafe destinations at delivery and, where the platform supports it, at click time.
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Malicious Attachment Protection
File type, structure and known malicious characteristics are inspected, with suspicious files stripped, held or quarantined.
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Business Email Compromise
Payment, supplier and executive requests are assessed on identity and context, because BEC often carries no link or malware.
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Policy, Quarantine & Visibility
Policies applied by group, domain or risk level, with quarantine review, alerting and reporting the security team can act on.
From Incoming Message
to Secure Delivery
The same path runs for every message, every time. That consistency is what turns email security from a set of tools into an operational control.
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Receive
Email enters the organisation's protected email environment.
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Inspect
Sender, domain, content, URLs and attachments are evaluated.
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Verify
Relevant sender and identity signals are checked.
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Analyze
Security engines and configured policies assess potential risk.
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Detect
Suspicious or malicious characteristics are identified.
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Quarantine / Block
Risky messages can be held or blocked according to policy.
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Deliver
Approved messages continue to the intended mailbox.
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Monitor
Security teams maintain visibility into email-security events.
What email security changes
for the business
Email security is measured in fraud that does not happen, hours the team does not lose, and questions leadership can answer with evidence.
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Lower Phishing Exposure
Fewer deceptive messages reach users, so security depends less on any one person spotting the difference.
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Protected Payment Workflows
Invoice, supplier and approval conversations get stricter handling, where business email compromise does the most damage.
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Fewer Interruptions
Tuned policies reduce false positives, so legitimate business mail keeps moving without constant release requests.
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AI-Assisted Triage
AI-assisted analysis helps process large volumes of email-security signals and prioritize suspicious activity for analyst review.
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Evidence for Compliance
Reporting on detections, policy outcomes and quarantine activity gives auditors and leadership a clear record.
Outcomes depend on the platform selected, the policies configured and how they are maintained. No email security control identifies every threat, so gateway protection is designed to work alongside user awareness, monitoring and incident response.
Industries that depend on
trusted email
Wherever approvals, payments, patient data or citizen records move by email, the mailbox becomes part of the control environment. Cylentrix designs email security for those environments.
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BFSI
Payment instructions, customer records and advisor communication make financial fraud and phishing a direct operational risk.
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Healthcare
Patient information, referrals and vendor correspondence carry sensitive data that regulators expect to be protected in transit.
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Manufacturing
Supplier invoices and purchase correspondence are a favoured target for impersonation and altered payment details.
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IT & Technology
Large user environments, client communication and privileged accounts make credential phishing a persistent concern.
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Government
Citizen data and inter-department correspondence carry regulatory expectations and a high impersonation risk.
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Retail
Customer data, marketing domains and high supplier volumes create both fraud exposure and brand-spoofing risk.
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Education
Thousands of student and staff mailboxes, with high turnover, make consistent policy and awareness essential.
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Logistics & Infrastructure
Shipment, customs and contractor email keeps operations moving, so disruption or fraud carries immediate business impact.
Why enterprises choose
Cylentrix for email security
Email security touches identity, endpoints, data and the network at once. Cylentrix works across all four, so the gateway is designed as part of your security architecture rather than bolted onto it.
Cybersecurity, IT and telecom under one roof
Mail routing, DNS, endpoints and user identity are usually owned by different teams. We work across all of them.
Enterprise email-security understanding
Experience with Microsoft 365 and Google Workspace environments, hybrid mail flow and multi-domain estates.
Security architecture capability
The gateway is designed with authentication records, routing, exceptions and failure modes considered up front.
Threat monitoring expertise
Email detections are routed into monitoring workflows so alerts reach analysts instead of accumulating unread.
Identity and access understanding
Phishing usually targets credentials, so email controls are aligned with the identity controls behind them.
Data protection awareness
Outbound policy and email data protection are considered alongside inbound threat filtering, not after it.
Incident response integration
When a phishing message lands, the response path, containment steps and evidence handling are already defined.
Risk-based approach
Policies are tuned to your risk profile and business tolerance, so protection does not arrive as blanket disruption.
India, USA and Singapore presence
Enterprise-focused implementation and support across three regions, under one delivery standard.
Technology &
Security Partners
Cylentrix works with established email-security and enterprise technology platforms, selecting the right fit for each environment rather than a single default.
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Proofpoint
Email security, anti-phishing and threat protection
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Mimecast
Secure email gateway and email resilience
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Microsoft
Microsoft 365 email and collaboration security
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Barracuda
Email protection, filtering and impersonation defence
Practical guidance for the
team that owns the mailbox
Written by the Cylentrix security practice for the IT and security leaders who will run email security day to day.
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Playbook
Enterprise Phishing Protection Playbook
Layered phishing protection: gateway policy, identity controls, user reporting and what to do in the first hour.
Read the playbook -
Prevention Guide
Business Email Compromise Prevention Guide
How BEC actually unfolds, which signals matter, and the payment and approval controls that reduce exposure.
Read the guide -
Technical Guide
Secure Email Gateway & Email Threat Protection Guide
Deployment models, mail-flow design, SPF, DKIM and DMARC, policy tuning and quarantine operations.
Download the guide
Email security,
answered directly
The questions security and IT leaders ask before committing to a Secure Email Gateway, answered the way our engineers answer them.
What is a Secure Email Gateway?
A Secure Email Gateway (SEG) is an email security control that inspects inbound and outbound email before it reaches or leaves a mailbox. It evaluates sender and domain characteristics, message content, embedded URLs and attachments against configured security policies, then delivers, quarantines or blocks the message. Exact capabilities depend on the email-security platform selected and how it is configured.
How does a Secure Email Gateway protect against phishing?
Phishing protection works by combining several signals rather than one test: sender and domain authentication results, sender reputation, message structure and language patterns, embedded link destinations, attachment behaviour and known threat intelligence. Messages showing suspicious combinations of signals can be blocked, quarantined or flagged for user caution according to policy. No email security control detects every phishing attempt, so gateway controls are usually paired with user awareness and monitoring.
What is Business Email Compromise?
Business Email Compromise (BEC) is targeted email fraud in which an attacker uses a compromised or impersonated business identity, often an executive, finance contact or supplier, to request payments, data or account changes. BEC messages frequently carry no malware or malicious link, which is why identity signals, communication context and payment-related policy controls matter as much as content filtering.
Can email security protect against malicious attachments and URLs?
Yes. Attachments can be inspected for file type, structure and known malicious characteristics, and suspicious files can be held for review, stripped or quarantined under policy. URLs can be checked against reputation and threat-intelligence sources, and links can be rewritten so the destination is evaluated at the time the user clicks. These controls reduce risk substantially but cannot be described as complete protection.
How does email impersonation protection work?
Impersonation protection evaluates whether a message is genuinely from the identity it appears to represent. It checks domain authentication records such as SPF, DKIM and DMARC, looks for lookalike domains and display-name mismatches, and compares the sender against known executives, suppliers and internal contacts. Messages that resemble a trusted identity without matching its verified characteristics can be flagged, quarantined or blocked.
Can Secure Email Gateway policies be customized?
Yes. Policies are normally defined per organisation and can differ by group, mailbox, domain or risk level. Typical policy decisions include how strictly to treat unauthenticated senders, which attachment types are allowed, how quarantined mail is reviewed and released, what warnings users see on external mail, and which events raise alerts to the security team.
How does AI support email threat detection?
AI-assisted analysis helps security teams process large volumes of email-security signals and prioritize suspicious activity. It is useful for pattern analysis across many messages, sender behaviour comparison, anomaly identification and alert enrichment. Decisions on ambiguous or high-impact cases still involve configured policy and human review, and AI does not replace email-security analysts.
How can Cylentrix help implement email security?
Cylentrix assesses the current email environment and risk profile, designs the email-security architecture, helps select and deploy a suitable Secure Email Gateway platform, configures policies for phishing, impersonation, attachments and URLs, integrates alerts with monitoring and incident response, and supports ongoing tuning, quarantine management and reporting across India, USA and Singapore.
Protect Every
Business Conversation
Strengthen email security, reduce phishing risk and protect users from malicious messages, impersonation and business email compromise. Tell us about your email environment and a Cylentrix security engineer will come back with a practical next step.
- Review of your current email security and risk profile
- Secure Email Gateway platform fit for your environment
- Policy, quarantine and reporting designed around your team
Talk to a Security Expert
Share a few details and we will respond with scope, options and indicative pricing.
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