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RS
Collaboration

Mail Server & Office 365

Hybrid mail architecture with Exchange Online, hardened SPF/DKIM/DMARC records and long-term archival.

Messaging Engineer 8 weeks
100%
DMARC coverage
+35%
Inbox placement
7 years
Retention policy
0
Compromised accounts
Challenges
  • Legitimate mail landing in spam due to missing auth records.
  • No retention or legal-hold policy for regulated data.
  • Ad-hoc distribution lists with no ownership.
Solutions
  • Published SPF, DKIM and DMARC with reporting and gradual policy tightening.
  • Configured tenant-wide retention labels and litigation hold.
  • Migrated DLs to modern shared mailboxes and Groups with ownership.
Business Impact

Enterprise-grade deliverability and compliance across all business domains.

Technology Stack
Office 365Exchange OnlineSPF/DKIM/DMARCRetention Policies
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