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Introduction

Build, operate, and scale your outbound infrastructure from one place. TenantCore is an outbound email infrastructure platform for operators, agencies, and lead generation teams running mailboxes on Microsoft 365. Bring your existing Microsoft 365 tenant, add domains you already own, and use TenantCore to configure DNS, create mailboxes, connect sending tools, control sending limits, access mailboxes, monitor infrastructure status and sending reputation, and keep the operation organized as it grows. Microsoft 365 and Exchange Online power the underlying mail infrastructure. TenantCore gives you the operational layer around it.

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What TenantCore helps you do

TenantCore brings the infrastructure workflow into one place:
  • Connect Microsoft 365 tenants you already own or administer.
  • Add sending domains and track their readiness.
  • Configure DNS automatically with supported providers, or follow guided manual DNS setup.
  • Create and manage mailboxes without working through multiple Microsoft admin portals.
  • Protect mailbox credentials and set up MFA through guided security workflows.
  • Open mailboxes in Outlook through delegated mailbox access.
  • Set mailbox sending limits and enforce them through Exchange Online.
  • Connect mailboxes to supported sending tools and manage connection state from TenantCore.
  • Monitor infrastructure and sending reputation with alerts, notifications, and Reports.
  • Automate infrastructure workflows with the TenantCore API on Complete.

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Who TenantCore is for

TenantCore is designed for people operating outbound email infrastructure at a scale where manual Microsoft 365 administration starts becoming the bottleneck. That includes solo operators managing multiple domains, outbound and lead generation agencies managing infrastructure across clients, and internal teams that need a repeatable way to create, secure, connect, monitor, and scale Microsoft 365 mailboxes. You do not need to give up control of your Microsoft 365 tenant. TenantCore automates and organizes the infrastructure you connect to it.

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How the infrastructure fits together

TenantCore uses a simple resource hierarchy:
Each connected tenant can contain up to 12 domains, and each domain can contain up to 3 mailboxes, for up to 36 mailboxes per tenant. Around those resources, TenantCore manages the operational workflows:
The result is one place to manage the infrastructure lifecycle instead of moving between Microsoft 365, your DNS provider, sending tools, and separate monitoring tools for every routine task.

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What TenantCore does not do

TenantCore does not register domains for you, and connecting a domain does not transfer ownership of that domain to TenantCore. For the current bring-your-own-tenant experience, you also bring a Microsoft 365 tenant that you are authorized to administer. TenantCore then operates against resources connected to your TenantCore account. TenantCore does not guarantee inbox placement. It manages infrastructure configuration, sending controls, monitoring, and reputation signals, while deliverability still depends on factors such as list quality, content, recipient engagement, and sending behavior.

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Where to start

If this is your first time using TenantCore, continue to Getting Started to understand the tenant/domain/mailbox model, confirm your prerequisites, and connect your first Microsoft 365 tenant. If you already understand the product model and want to begin immediately, go directly to the Quickstart. If you are building your own automation around TenantCore, see the API Reference. The Complete API operates only on resources already registered to and owned by your TenantCore account.