Microsoft 365 email security for complex Exchange Online environments.
Practical, hands-on consulting to help you design, configure, optimize and troubleshoot your Microsoft 365 email security environment with confidence.
Expertise across Exchange Online and Microsoft 365 email security implementations, integrations and ongoing technical support.
- Exchange Online and EOP configuration
- Anti-spam, anti-malware and anti-phishing
- Mail flow and connector troubleshooting
- SPF, DKIM, DMARC and deliverability
- Hybrid and coexistence scenarios
What we help you solve
We work with IT, security and messaging teams to resolve real-world challenges across Microsoft 365 and Exchange Online environments.
Mail flow and delivery issues
Investigate delayed, rejected or missing messages, connector problems and routing issues in Exchange Online.
Connector and hybrid configuration
Design, configure and troubleshoot connectors for hybrid, third-party or multi-tenant mail-flow scenarios.
Anti-spam, anti-malware and policy tuning
Review and optimize EOP and Microsoft 365 email security policies to improve protection without blocking legitimate mail.
Authentication and deliverability
Review SPF, DKIM, DMARC, TLS and sender-reputation issues affecting email delivery and policy enforcement.
Phishing and impersonation protection
Review and tune anti-phishing, impersonation and spoof-protection controls within the scope of your Microsoft 365 environment.
Coexistence and migration support
Assist with coexistence, migration and cutover considerations between on-premises Exchange, Exchange Online and connected mail systems.
Typical Microsoft 365 email architecture
A representative standard mail flow showing Microsoft 365 email security with Exchange Online Protection (EOP). Actual routing varies by deployment.
and threats
Anti-phishing and impersonation protection
Transport rules and policy enforcement
Reputation and threat intelligence
(Exchange Online)
communication
and threats
Connector validation
Transport and policy controls
Hybrid mail-flow dependencies
and routing
environment
How we work
A structured approach to identify, resolve and validate issues in your Microsoft 365 email security environment.
Understand
Establish your mail-flow architecture, current configuration, requirements and observed issues.
Analyze
Review relevant message trace data, SMTP responses, connectors, transport rules and security policies.
Remediate
Implement the required configuration, policy or routing changes with controlled updates.
Validate
Confirm expected mail flow, policy behavior and relevant security controls after remediation.
Document
Provide findings, changes, validation results and recommendations where appropriate.
Example: Troubleshooting scenario
An illustrative example showing how we investigate and resolve issues in a Microsoft 365 email environment.
- Environment
- Microsoft 365 (Exchange Online)
- Symptom
- External messages rejected for a specific recipient scope
- Observed
- Message accepted by SMTP, then failed during Exchange Online transport processing
- Investigation
- Reviewed message trace, connector configuration, mail-flow rules and policy scope
- Finding
- A mail-flow rule was incorrectly rejecting the affected external messages
- Resolution
- Corrected the rule scope and validated successful delivery
220 mx.example.protection.outlook.com Microsoft ESMTP EHLO mail.sender.example 250-STARTTLS 250 SIZE 157286400 MAIL FROM:<sender@example.com> 250 2.1.0 Sender OK RCPT TO:<user@contoso.example> 250 2.1.5 Recipient OK DATA 354 Start mail input; end with <CRLF>.<CRLF> . 250 2.6.0 Message accepted for delivery
Status: Failed after acceptance Direction: Inbound Recipient: user@contoso.example Event: Receive → Transport rule → Fail Enhanced status: 5.7.1 Detail: Delivery blocked by mail-flow rule scope
Inbound connector: enabled Sender validation: expected TLS: available Connector routing: healthy Finding moved to transport-rule evaluation
Finding: mail-flow rule scope incorrectly matched recipient Action: rule conditions corrected Validation: external test message delivered successfully Result: expected mail flow restored
What you receive
Clear findings, practical recommendations and hands-on support appropriate to the scope of the engagement.
Detailed findings
Root-cause analysis with clearly documented observations, affected configuration and recommended actions.
Configuration changes
Implementation assistance for agreed configuration, policy, connector or routing changes.
Validation results
Confirmation that expected mail flow and relevant security controls behave correctly after remediation.
Technical documentation
Clear documentation of findings, configuration changes, validation and recommendations.
Knowledge transfer
Walkthrough of findings and changes with your messaging or security team where appropriate.
Frequently asked questions
Common questions about our Microsoft 365 email security consulting services.
What types of Microsoft 365 environments do you support?
We can support Exchange Online and related Microsoft 365 email security configurations within the consulting areas described on this page. Share your architecture and requirement so the exact scope can be confirmed before engagement.
Can you help with SPF, DKIM and DMARC issues?
Yes, where those authentication controls relate to your Microsoft 365 mail flow, sending domains, connected systems or delivery problem being investigated.
Can you troubleshoot email delivery issues in Exchange Online?
Yes. Troubleshooting can include message trace data, SMTP responses, connectors, transport rules, authentication dependencies and other relevant configuration evidence.
Can you assist with hybrid or coexistence scenarios?
Yes, where the engagement involves mail-flow, connectors, routing or coexistence between Exchange Online, on-premises Exchange or supported third-party email security systems.
Do you assist with anti-spam and anti-phishing policy tuning?
Yes, within the Microsoft 365 email security controls that are in scope for your environment. The objective is to improve protection while minimizing unnecessary disruption to legitimate mail.
Do you provide implementation support or only recommendations?
Both can be considered. Engagements can be scoped for analysis and recommendations, hands-on implementation assistance, validation, documentation or a combination of these.
Need help with your Microsoft 365 email environment?
Whether you need help with a specific issue, a configuration review or ongoing support, we can help you get the most out of your Microsoft 365 investment.
Discuss Your Requirement