DO Mailbox review
A domain-priced email service with strong administration and authentication features.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
DO Mailbox is a business email hosting service for companies, agencies, enterprises, and organizations managing custom domains. Its domain-based pricing includes unlimited mailboxes per domain, centralized administration, authentication with DMARC, SPF, and DKIM, AI-assisted spam and phishing filtering, catch-all addresses, routing rules, analytics, and API access on higher tiers. The service runs on the web and through an API, with a 14-day trial for evaluation.
The published plans scale by domain count and total storage. Starter costs $10 per domain per month or $96 per domain per year, with one custom domain, unlimited mailboxes, and 200 GB of total storage. Business costs $18 per domain per month or $172 per domain per year, adding three custom domains, 500 GB of total storage, advanced administration, DMARC aggregate reports, and live chat and email support. Pro costs $25 per domain per month or $240 per domain per year, with five custom domains, 1 TB of total storage, a dedicated IP address, forensic DMARC reports, and 24/7 priority phone support. Enterprise / Custom offers custom domain count, storage quota, dedicated infrastructure, a custom SLA, and priority onboarding.
Security and administration are the clearest reasons to consider DO Mailbox. Real-time dashboards, DMARC reporting, malware detection, phishing protection, role-based permissions, catch-all addresses, and routing rules support centralized domain management. Integrations include Microsoft 365, Google Workspace, Salesforce, Zapier, Okta, Slack, REST API, and webhooks. The service suits organizations that prioritize domain-level administration and authentication across multiple mailboxes. It is less suitable for teams seeking a free plan, mobile apps, or traditional client protocols, or for organizations that need storage quotas defined per mailbox.
DO Mailbox pros and cons
- Where it wins
- Unlimited mailboxes per domain across paid plans
- DMARC, SPF, DKIM, and AI phishing filtering
- Role-based administration, routing, API, and webhooks
- Where it doesn't
- No free plan is available
- Storage is specified as a total plan quota, not per mailbox
- No mobile apps or client protocols are listed
DO Mailbox fact sheet, pricing and score →
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