Most organizations understand that email backup means not losing inbound messages. Fewer have thought through what happens to their operations during an email outage — the hours their teams cannot respond to customers, cannot coordinate internally, cannot send time-sensitive documents. Email continuity addresses that operational gap. It is not about preserving mail. It is about keeping people working.
What Email Continuity Is
Email continuity is a service that maintains a live, accessible emergency mailbox for your users whenever your primary mail system is unavailable. When the primary goes down — whether for minutes or days — users log into a browser-based portal with their existing credentials and continue sending and receiving email normally. New inbound messages appear in the emergency mailbox in real time. Outbound messages are delivered to recipients through the continuity platform's own mail infrastructure. Recent mailbox history is available for reference.
When the primary system recovers, the continuity platform synchronizes all activity from the outage period back to the primary mailboxes automatically. Users return to their normal client with a complete record of everything that happened during the outage.
Continuity for Any Mail Platform
Infinity Data Center's email continuity services are available for any business mail environment — not just StrataMail. Whether your organization runs StrataMail, on-premise Exchange, Microsoft 365, Google Workspace, or another hosted email platform, continuity can be layered in as a protection service. The continuity infrastructure operates independently of your primary mail system, which means it remains available even when the primary system — and the infrastructure it runs on — is completely offline.
Microsoft 365 Email Continuity
Microsoft 365 is a reliable platform, but it is not immune to outages. Microsoft's service health history shows periodic incidents affecting Exchange Online — including authentication failures, message delivery delays, and complete service unavailability in specific regions. For organizations whose entire email infrastructure lives in Microsoft's cloud, these events mean complete loss of email access with no fallback.
Infinity Data Center's Microsoft 365 Email Continuity service provides an independent continuity layer for M365 customers — so when Microsoft has an incident, your team is not simply waiting for Microsoft to resolve it. Contact us to discuss M365 continuity configuration.
Continuity in Disaster Recovery Planning
Email continuity is often missing from formal disaster recovery plans — or included as an afterthought. This is a mistake. When a disaster takes down primary infrastructure, email is the first communication tool an incident response team needs. If email is part of the infrastructure that failed, response coordination degrades immediately.
A properly configured continuity service activates automatically — no IT team action required. By the time your team is aware of the incident and beginning response, email is already working through the continuity platform. This is particularly important for scenarios where IT staff themselves may not be immediately reachable.
Infinity Data Center's continuity infrastructure is hosted in our Knoxville data center facilities — geographically independent from most customer on-premise environments, providing meaningful separation from common regional risk events.
RTO and RPO for Email
Two metrics define email availability requirements in a DR plan. Recovery Time Objective (RTO) is how quickly email access must be restored after an outage begins. For most businesses, an email RTO of 15–30 minutes is appropriate. Email continuity meets this target by activating automatically within minutes of primary server failure — often before users notice anything is wrong.
Recovery Point Objective (RPO) is how much mailbox history must be available in the emergency environment. Infinity Data Center's continuity services maintain a synchronized snapshot of recent message history — typically 30 days — available in the emergency portal from the moment continuity activates. Older history is available in the primary system when it recovers.
Testing Your Email Continuity
A continuity service that has never been tested is infrastructure you cannot rely on in a real event. Basic continuity testing should be performed at least annually and should include:
- Access the continuity portal from outside your office network — from a mobile device or home connection — to verify it is reachable independently of your primary infrastructure
- Log in with production credentials and confirm the mailbox portal loads correctly
- Send a test message from the continuity portal and confirm it is delivered to the recipient
- Receive a test message sent to your address during the test and confirm it appears in the emergency mailbox
- Verify the portal URL and login procedure are documented in your DR runbooks and accessible to key staff when primary systems are unavailable
Infinity Data Center can assist with continuity testing and help document the procedures for your DR runbook. Contact us or call 866.790.4678 to discuss email continuity options for your environment.