Sender
Who claims to have sent it.
EMAIL SECURITY
Email connects people to the business. It can also connect threats to them.
Email remains one of the main communication channels among employees, customers, suppliers, and partners — and a digital identity frequently used to establish trust.
That trust needs protection.
Add Solution designs and implements email security architectures combining protection against phishing, malware, spoofing, and abuse; domain authentication with SPF, DKIM, and DMARC; message analysis; and integration with identity, endpoints, and security monitoring.
SPFDKIMDMARC
CONTENT / URL / ATTACHMENT
DELIVERQUARANTINEBLOCK
ENGENHARIA APLICADA
Proteger a mensagem exige combinar identidade do domínio, conteúdo e comportamento.
Estruturamos proteção de e-mail com SPF, DKIM, DMARC, gateway, identidade e resposta para reduzir fraude sem interromper fluxos legítimos.
Arquitetura, execução e operação tratadas como partes da mesma responsabilidade.
EMAIL IS MORE THAN A MESSAGE
Every message carries identity, origin, reputation, content, and context.
A delivery decision can combine different signals, depending on the platform. Email security should not depend on a single check.
Domain
Which digital identity is being used.
Authentication
SPF, DKIM and DMARC alignment.
Reputation
History and context when available.
Content
Text, URLs and attachments.
Policy
Conditions for delivery or processing.
SENDER → DOMAIN → AUTHENTICATION → REPUTATION → CONTENT / URL / ATTACHMENT → POLICY →
MAILBOX
The most convincing attack does not always need to exploit a technical vulnerability.
Social engineering, context spoofing, links, attachments, requests, fake pages, and credential theft exploit human decisions.
When the target is human judgment, security must combine technology, context, and process.
A message may contain no malware and still represent a critical risk.
Impersonation, lookalike domains, compromised accounts, financial requests, false urgency, and trusted relationships can all play a role in BEC.
Not every threat arrives as a malicious file. Some arrive as an apparently legitimate request.
Identity or origin elements can be forged.
Authentication, reputation, domain analysis, context and policies help assess a message, depending on the platform.
A message may attempt to impersonate a trusted person or relationship.
Domain analysis, display names, context, behavior and policies can produce signals, without guaranteeing detection of every form of abuse.
Which servers are authorized to send email for your domain?
SPF connects the domain, DNS policy, and authorized senders. Inventory, third-party services, and maintenance are essential; SPF alone does not prevent spoofing or phishing.
DOMAIN → SPF POLICY → AUTHORIZED SENDERS
Does the message have a signature that can be validated by the sending domain?
A cryptographic signature, selector, and public key in DNS enable validation according to the configuration.
DKIM adds evidence of authenticity and integrity to the message.
DMARC
SPF and DKIM generate signals. DMARC adds policy and domain alignment.
SPF + DKIM + ALIGNMENT → DMARC → POLICY + REPORTING
The none, quarantine and reject policies and DMARC reports need to be adopted according to the inventory and maturity level.
DMARC should not necessarily start at reject. First, we need to understand who actually sends email on behalf of the organization.
Email security also means protecting the company’s digital reputation.
SPF, DKIM, DMARC, inventory, authorized third parties, monitoring, and DNS help reduce domain misuse.
Protecting the inbox is part of the problem. We must also protect what third parties receive in your company's name.
Email security works in two directions.
IP and domain reputation, behavior, lists, and history can add context to inbound and outbound traffic.
Protect what comes in and preserve trust in what goes out.
A link's destination can be as important as the text that presents it.
Reputation checks, categorization, URL rewriting, click-time protection and analysis may be available, depending on the platform.
Certain files need to be observed for what they do, not merely for what they appear to be.
File type, reputation, signatures, behavior, policies and sandboxing where supported can help assess processes, connections and changes, without guaranteeing complete detection.
A file may appear legitimate by its name. Analysis must consider more than the extension.
Email may be only the start of a longer chain.
Blocking the message is an opportunity for prevention. Detecting what may have passed through requires additional controls.
Endpoint Security (EDR/XDR) Backup & Disaster RecoveryProtecting the message and protecting the account are related but different problems.
Credentials, MFA, identity, sessions, access, and compromised mailboxes require their own controls.
Content security protects communication. Identity security protects whoever controls the account.Zero Trust & Secure Access
Moving email to the cloud changes the infrastructure. It does not eliminate the need for a strategy.
Microsoft 365, Google Workspace and other platforms can combine native controls, gateways, APIs, identity and telemetry, depending on the environment.
CloudFlows must be understood before implementation.
On-premises environments, cloud environments, external gateways, relays and third-party services can form different chains.
INTERNET → SECURITY LAYER → MAIL PLATFORM → USER
EMAIL FLOW
When an email does not arrive, security is only one possible cause.
SENDER → DNS / MX → SMTP → SECURITY GATEWAY → MAIL SERVER / CLOUD → MAILBOX
DNS, MX, SPF, DKIM, DMARC, SMTP, TLS, reputation, queue, policy, relay, routing, and quarantine all play a role in diagnostics.
Diagnosing email requires understanding the entire delivery chain.
Encrypting transport protects the path. It does not determine whether the message is legitimate.
TLS, certificates and opportunistic or mandatory use according to the architecture protect SMTP communications in transit, without being equivalent to end-to-end encryption.
Email security does not end with incoming messages.
Addressing compromised accounts, outbound spam and malware through policies, reputation management, abuse controls, limits and monitoring helps preserve domain and IP trust.
A legitimate message can also carry information that should not leave the organization.
Content, attachments, patterns, classification, recipients and policies can be assessed by DLP where supported.
Security and communication continuity must coexist.
ALLOW · QUARANTINE · TAG · REJECT · BLOCK · ANALYZE
Decisions can combine signals without advocating indiscriminate aggressive blocking.
Blocking a threat provides security. Blocking a legitimate proposal can affect the business.
Tuning, justified allowlists, policies, reputation, logs, analysis, exceptions, and monitoring preserve communication.
A mature policy must provide protection without turning protection into unavailability.
When a message is suspicious, we need to reconstruct the path it traveled.
Sender, recipient, timestamp, message ID, headers, authentication results, action, URL, attachment, policy, and gateway produce evidence according to availability.
Logs turn a suspicious message into investigable evidence.SIEM & Security Analytics
EMAIL + SIEM/XDR
Signals from different controls can broaden the context.
EMAIL ALERT + IDENTITY EVENT + ENDPOINT EVENT + NETWORK EVENT → CONTEXT
Correlation depends on existing integrations and does not automatically confirm an incident.
Endpoint Security (EDR/XDR)EMAIL SECURITY ASSESSMENT
Is your domain simply sending and receiving, or does it have a real protection architecture?
We discover, map, validate, and relate authentication, flow, protection, and operation.
01MX
02DNS
03SPF
04DKIM
05DMARC
06Relays
07Gateways
08Mail platform
09TLS
10Policies
11Anti-spam
12Anti-malware
13URLs
14Attachments
15Quarantine
16Logs
17Outbound
18Authorized third parties
19Integrations
DMARC DEPLOYMENT
Strong policy requires inventory, alignment, and progression.
A strong policy without an inventory can also block those who should be authorized to send.
01Inventory
02Publish
03Observe
04Identify senders
05Fix SPF/DKIM
06Validate alignment
07Increase enforcement
08Monitor
ADD SOLUTION METHOD
Engineering to protect identity, domains, mail flow and communication.
More than 15 years of experience connecting DNS, SMTP, email, identity, endpoint, firewall, cloud, SIEM, and operations.
- 01
Discover
Domains, platforms and flows.
- 02
Map
Authorized senders and third parties.
- 03
Authenticate
SPF, DKIM and DMARC.
- 04
Protect
Messages, links and attachments.
- 05
Analyse
Signals, reputation and behavior.
- 06
Integrate
Identity, endpoint and SIEM.
- 07
Observe
Logs, queues and decisions.
- 08
Adjust
Reduce noise and preserve communication.
- 09
Evolve
Monitor changes and risks.
The platform filters messages. Engineering protects identity, domain, flow, and communication.
TECHNOLOGIES & PRODUCTS
Architecture, protection, authentication, integration and operations.
Vendors and platforms belong on technology pages. The solution begins with the trust that communication needs to preserve.
Cybersecurity Technologies & ProductsPERGUNTAS FREQUENTES
Decisões importantes sobre Segurança de E-mail
Respostas objetivas para dúvidas técnicas e operacionais que costumam surgir antes de um projeto.
01SPF impede phishing?
Não. SPF declara servidores autorizados para um domínio, mas precisa integrar-se a outros sinais e controles.
02DKIM identifica a pessoa que enviou a mensagem?
Não. DKIM permite validar uma assinatura associada ao domínio; não prova a identidade pessoal do remetente.
03DMARC deve começar em reject?
Não necessariamente. Inventário, observação, correção de SPF/DKIM e validação de alinhamento devem orientar o aumento progressivo de enforcement.
04MFA elimina comprometimento de contas?
Não. MFA fortalece autenticação, mas precisa fazer parte de uma estratégia mais ampla de identidade e segurança.
05Gateway de e-mail substitui EDR?
Não. Segurança de e-mail e Endpoint Security protegem partes diferentes e complementares da cadeia.
FALE COM UM ESPECIALISTA
Vamos conversar sobre Segurança de E-mail.
Share the context of your environment, the perceived impacts and the results your organization seeks. Add Solution will direct the conversation to the most appropriate experts.
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