TenantCore is the better fit when Microsoft 365 itself is the infrastructure you want to control and operate. Mailforge is a different model: distributed shared email infrastructure with hosted mailboxes, automated DNS, and tooling built around provisioning at scale.
Quick comparison
TenantCore is the better fit when Microsoft 365 itself is the infrastructure you want to control and operate. Mailforge is a different model: distributed shared email infrastructure with hosted mailboxes, automated DNS, and tooling built around provisioning at scale.
You want Microsoft 365 environments you control to remain the foundation of your outbound infrastructure. You need Outlook access, sending limits, alerts, reports, and tenant/domain/mailbox visibility around that infrastructure. You want infrastructure management without moving onto a proprietary hosting model.
You want purpose-built shared cold-email infrastructure rather than native Microsoft 365 mailboxes. You want Mailforge to host and maintain the mailboxes as part of the subscription. Bulk domain, mailbox, DNS, and API workflows around shared infrastructure are your priority.
Where TenantCore fits
You want Microsoft 365 environments you control to remain the foundation of your outbound infrastructure.
You need Outlook access, sending limits, alerts, reports, and tenant/domain/mailbox visibility around that infrastructure.
You want infrastructure management without moving onto a proprietary hosting model.
Side by side
The important difference is not how many boxes each product can check. It is what you own, what the provider supplies, and what stays under your control as you scale.
Operating model
TenantCore
Operate connected Microsoft 365 environments and keep the surrounding outbound infrastructure workflow centralized.
Mailforge
Distributed shared email infrastructure with mailbox hosting and maintenance included.
Mailbox foundation
TenantCore
Microsoft 365 / Exchange Online environments connected to TenantCore.
Mailforge
Shared infrastructure built specifically for cold-email sequences rather than native Gmail or Outlook infrastructure.
DNS
TenantCore
Automatic DNS with supported providers and guided manual setup elsewhere.
Mailforge
Automated DNS setup and bulk DNS management are core parts of the product.
Sending tools
TenantCore
Campaigns stay in your sending tool; supported connections can be managed from TenantCore.
Mailforge
Designed to feed infrastructure into Salesforge or other sending software rather than run sequences itself.
Ongoing operations
TenantCore
Daily limits, Outlook access, infrastructure status, sending reputation, alerts, reports, and mailbox connections stay visible in one product.
Mailforge
Public positioning emphasizes provisioning, hosting, DNS, workspaces, domain management, and API/MCP/CLI automation.
Where Mailforge may fit better
Mailforge is not being treated as a bad product here. These are the situations where its current public model may match what you want more closely.
You want purpose-built shared cold-email infrastructure rather than native Microsoft 365 mailboxes.
You want Mailforge to host and maintain the mailboxes as part of the subscription.
Bulk domain, mailbox, DNS, and API workflows around shared infrastructure are your priority.
Frequently asked
No. Your campaigns stay in the sending tool you already use. TenantCore manages the Microsoft 365 infrastructure behind the mailboxes and keeps supported connection status visible in one place.
No. TenantCore is designed to connect to Microsoft 365 environments you control. A separate managed-tenant option is available when you want TenantCore to supply the environment instead.
When the goal is to keep Microsoft 365 under your control while reducing repeated work across domains, mailboxes, DNS, sending limits, sending-tool connections, monitoring, alerts, and reporting.
Bring domains, mailboxes, DNS, daily limits, sending-tool connections, alerts, and reports into one operating workflow as you scale.