What is TenantCore?
TenantCore is an outbound email infrastructure platform for Microsoft 365. It brings domains, mailboxes, DNS, sending limits, sending-tool connections, monitoring, alerts, and reports into one operating workflow.
Product
One place to run
outbound infrastructure.
Keep domains, mailboxes, DNS, sending tools, alerts, and reports together as you scale.
TenantCore in plain English
The short answer before the product tour.
Who is TenantCore for?
TenantCore is built for cold email operators, agencies, and outbound teams that want to keep adding Microsoft 365 environments, domains, and mailboxes without turning infrastructure management into more manual work.
Is TenantCore a sending tool?
No. Campaigns stay in the sending tool you choose. TenantCore manages the infrastructure behind the mailboxes.
How does TenantCore scale?
TenantCore uses a repeatable environment structure: 12 domains per connected Microsoft 365 environment and 3 mailboxes per domain. Add more environments as you grow, so total domain and mailbox capacity expands with your operation.
Explore
Choose the part of the operation you want to improve.
01
Environments
Keep each Microsoft 365 environment and its resources in one place.
02
Domains & DNS
Add domains, set up DNS, and see when they are ready.
03
Mailboxes
Create mailboxes and manage limits, access, credentials, and MFA.
04
Outlook Access
Keep Outlook access while the same mailboxes work with sending tools.
05
Sending Tools
Use your mailboxes with Microsoft OAuth-compatible sending tools, with direct integrations available for a more automated connection flow.
06
Monitoring & Alerts
Spot changes in status, sending location, and sending reputation.
07
Reports
See what happened, what changed, and what needs attention.
08
Complete API
Bring TenantCore workflows into your own systems.
Start with Plus
Try the full Plus workflow for 14 days.
Connect 1 Microsoft 365 environment and see how TenantCore fits your operation.