Email security services
Most breaches still start with a message someone believed. We secure the whole path that message travels: your sending domains, your mail platform configuration, the detection layer behind it, and the people who make the final call on whether to click.
Digisecuritas is a service firm, not a software vendor. The controls we design are the controls we monitor, and the results are reported to your leadership in plain business terms.
What email security covers
Email security is the set of controls that verify who is allowed to send on your behalf, filter what reaches your users, detect compromise inside the mailbox, and prove all of it to an auditor. It spans domain authentication, mail platform configuration, threat detection, user behaviour, and continuous monitoring. Encryption and filtering alone do not cover it.
| What we deliver | Domain authentication, platform hardening, threat detection and response, user resilience, monitoring and reporting |
| Who it is for | Organisations of roughly 50 to 5,000 employees running Microsoft 365, Google Workspace, or hybrid mail |
| Coverage | North America, EMEA, APAC. 24x7 monitoring where the managed tier is engaged |
| Engagement model | Project hardening, retained advisory, or fully managed. Vendor-neutral in all three |
Where email defences usually fail
These are the gaps we find most often when we take over an environment that already has email security in place.
DMARC exists, but does nothing
Plenty of organisations publish a DMARC record and stop at p=none, which reports impersonation without blocking it. Getting to enforcement means finding every legitimate sender first, including marketing platforms, invoicing tools, and regional offices nobody documented. That inventory work is the reason most projects stall.
The platform is running on defaults
Microsoft 365 and Google Workspace both ship with permissive settings that suit a smooth rollout rather than a hardened tenant. Legacy authentication left enabled, external forwarding unrestricted, and audit logging switched off will each undo a well-tuned filter.
Nobody watches the mailbox after login
Filtering stops messages at the door. Once credentials are stolen, the attacker works from inside a trusted mailbox: new forwarding rules, changed reply-to addresses, a quiet wait for the right invoice thread. Detection has to cover post-login behaviour, which is where mailbox auditing and identity and access management meet.
Vendor and supplier impersonation
Business email compromise rarely targets your domain directly. It targets the relationship, using a lookalike domain or a genuinely compromised supplier account already in the thread. Domain authentication does not help when the sender is authentic and the intent is not.
Training happened once, last year
An annual awareness module produces a completion certificate and very little behavioural change. Sustained reduction in click rates comes from repeated, role-relevant security awareness training tied to what your users are actually being sent.
What our email security service includes
Domain authentication and sender governance
Full sender discovery, then SPF, DKIM and DMARC implemented in stages until you can move to enforcement without breaking legitimate mail. We add BIMI where brand protection matters, and we keep the sender inventory current as your tools change.
Mail platform and gateway hardening
Configuration review and remediation across Exchange Online Protection, Defender for Office 365, Google Workspace, or a third-party gateway. Legacy protocols closed, forwarding controlled, quarantine and release workflows defined, audit logging switched on and retained. Deeper tenant work is covered under Microsoft 365 security.
Threat detection and response
Tuned detection for credential phishing, malicious attachments, payload-free BEC, and post-compromise mailbox activity. Alerts route into your managed SOC queue with defined response playbooks, so a suspicious inbox rule triggers action rather than a ticket nobody owns.
User resilience
Simulated phishing calibrated to your industry and to the pretexts your people actually receive, paired with short role-specific modules for finance, HR and executive assistants. Reporting tracks click rate, report rate and repeat exposure by department. Broader pretexting defence sits under social engineering prevention.
Data protection in transit
TLS enforcement, message encryption for regulated correspondence, and outbound rules that stop sensitive data leaving over email. Rules are written against your actual data classifications rather than a generic template.
Monitoring, reporting and governance
Monthly reporting your board can read: authentication status, blocked and delivered threat volumes, user behaviour trend, open remediation items, and framework alignment. Quarterly review with a senior advisor to reset priorities.
How the engagement runs
Discovery and scoping
Mail architecture, domains, sending services, current tooling, regulatory exposure, and who owns what internally. Ends with a signed scope and an NDA in place.
Typically 1 week
Baseline and prioritisation
Configuration and authentication baseline measured against ISO 27001, NIST CSF and your own obligations. Findings ranked by exploitability and business impact, not by scanner severity.
Typically 2 to 3 weeks
Hardening and implementation
Staged rollout to DMARC enforcement, platform remediation, detection tuning, and the first user resilience cycle. Change windows agreed with your IT team so mail flow is never at risk.
4 to 8 weeks, environment dependent
Continuous monitoring
24x7 detection, incident response coordination, monthly reporting, quarterly governance review. Adjustments as your estate and threat exposure change.
Ongoing
How email controls map to compliance frameworks
Email is one of the first areas an auditor examines, because the evidence is easy to pull and the gaps are easy to prove.
| Framework | What it expects of email | Where our service applies |
|---|---|---|
| ISO/IEC 27001:2022 | A.5.14 information transfer, A.8.7 protection against malware, A.6.3 awareness and training | Authentication, filtering, encryption rules, training records |
| SOC 2 | CC6.6 boundary protection, CC6.8 unauthorised software, CC7.2 anomaly monitoring | Gateway configuration, attachment controls, mailbox monitoring evidence |
| GDPR | Article 32 security of processing, Article 33 breach notification timelines | Encryption in transit, DLP rules, detection that supports 72-hour reporting |
| HIPAA Security Rule | 164.312(e)(1) transmission security | TLS enforcement and message encryption for PHI in email |
| NIST CSF 2.0 | Protect and Detect functions across data security, awareness, continuous monitoring | Control design plus 24x7 monitoring evidence |
| India DPDP Act, 2023 | Section 8(5) reasonable security safeguards | Documented email controls and breach-detection capability |
Alignment is not certification. Where you need an independent opinion for an auditor, that is an independent email security audit, delivered as a separate engagement.
Built, or independently validated
They know the estate, own the change process, hold the vendor relationships, and carry the operational load.
We test whether the controls behave as intended, document what is missing, and put a defensible opinion in front of your board or your auditor.
The two are not in competition. Independent validation gives a strong internal team the evidence it needs to argue for budget, and gives leadership a picture that is not assembled by the people being assessed.
The maker cannot be the checker.
Engage us for continuous protection, for independent validation, or for both. If your immediate need is a point-in-time opinion rather than ongoing management, start with the email security audit.
Who this service is for
We work best with organisations that already treat email as a business risk rather than an IT setting, and that want the controls documented well enough to survive scrutiny.
The team behind the service
Our founding team has led national cybersecurity practices at globally recognised consulting firms, designed enterprise security architecture, and built security operations centres for large regulated environments. Over 20 years of that experience sits behind every engagement, and senior people stay on the account rather than handing it to a delivery pool after the pitch.
We hold no reseller agreements and no OEM targets. When we recommend a control, the only reason is that it fits your environment.
Email security FAQs
Domain authentication through to DMARC enforcement, mail platform and gateway hardening, tuned detection with defined response playbooks, phishing simulation and role-based training, outbound data protection, and monthly reporting to leadership. Delivery is vendor-neutral, so the service works with the platform you already own.
Related services
Independent point-in-time assessment of your email controls
Tenant-wide hardening beyond mail flow
Sustained behavioural change, measured by department
Defence against pretexting across email, phone and in person
Controlling the credentials attackers are phishing for
24x7 monitoring, detection and incident response
Find out what your email controls are actually doing
A 30-minute discovery call with a senior advisor. We review your domains, authentication status and platform configuration, and tell you where the exposure sits. No obligation, no pitch deck.