/ Microsoft 365 email security
Make business email harder to impersonate and misuse.
Email security depends on more than a spam filter. Aegentra helps strengthen domain authentication, mailbox protection and the access controls around them. We review the legitimate services that send on your behalf, implement agreed policies and test the changes before broader enforcement.
On this page
Protect the domain, the message and the account
Your domain's identity
Review SPF, DKIM and DMARC together, including approved marketing, invoicing and other sending platforms. Progress enforcement using evidence from legitimate mail flows instead of publishing a restrictive policy without understanding its impact. Microsoft DMARC guidance.
Messages reaching your people
Review the anti-phishing, attachment, link and quarantine capabilities available under your actual subscriptions. Defender for Office 365 features vary by plan; the proposal identifies which controls can be configured and how they will be checked. Microsoft protection levels.
Accounts behind the mailbox
Examine sign-in protection, mailbox permissions and forwarding arrangements within the agreed scope. A legitimate account can also be misused, so domain authentication and message filtering must be considered alongside access security.
Improve protection without guessing at legitimate email
Start with an inventory of domains and authorised senders. Review current authentication and protection settings, agree the required changes and test a representative set of business messages. Progress the rollout with an identified owner for mail-flow issues, exceptions and suspicious-message handling.
The scope records DNS responsibilities, product prerequisites and any required coordination with your IT provider. It does not promise that every sender, application or personal device can be changed without third-party involvement.
What a scoped email uplift delivers
- An agreed domain and sender inventory.
- A record of the authentication and protection changes performed.
- Results of the agreed mail-flow and policy tests.
- Documented exceptions, quarantine responsibilities and escalation steps.
- Clear ownership of ongoing review and any separately contracted response service.
Make payment-change checks part of the workflow
Technology cannot establish that every convincing request is legitimate. As part of the agreed handover, identify how staff should report suspicious email and independently verify sensitive changes, such as new supplier bank details, through an established contact route. Do not rely on contact details supplied only in the suspicious message. ASD guidance on preventing business email compromise.
Select products around the requirement
Begin with the protections already available in your Microsoft 365 environment. Where additional software is appropriate, Aegentra can discuss eligible options through its Pax8 relationship and identify their cost, prerequisites and ongoing responsibilities. A product recommendation is separate from a claim that one tool eliminates all email risk.
Email security questions
Does DMARC stop all phishing or invoice fraud?
No. It helps receiving systems assess mail claiming to come from your domain when authentication and alignment are configured correctly. It does not eliminate lookalike domains, compromised legitimate accounts or every deceptive message.
Will a monitoring-only DMARC policy block impersonation?
A p=none policy is used to observe and tune authentication, not request rejection. Enforcement should follow an assessment of legitimate senders and the agreed rollout plan.
Is Proofpoint included?
No particular third-party email product is included by default. The proposal names any selected product, confirms availability and licensing, and identifies who configures and operates it.
Do you provide ongoing mailbox monitoring?
An uplift can configure agreed alerts and hand over response procedures. Recurring monitoring or response requires an explicit, separately resourced service with defined operating hours and responsibilities.
Tell us what is happening in your inbox
Whether the concern is impersonation, suspicious forwarding, repeated phishing or uncertain domain settings, start with the business problem. We will discuss the relevant tenant, domains and delivery scope before proposing changes.
Enquire about email securityRelated services: Microsoft 365 security assessment · Microsoft 365 data protection · ISO 27001 implementation