How far can mailbox capacity scale?
TenantCore does not impose an overall mailbox ceiling. Each connected Microsoft 365 environment supports 3 mailboxes per domain across 12 domains, and you can add more environments whenever you need more capacity.
Mailboxes
Create the mailboxes you need. Keep the details in one place.
Manage mailbox access, credentials, MFA, daily limits, Outlook, and sending-tool connections from one workflow.
Quick answers
The mailbox details operators ask about first.
Can I control daily sending limits?
Yes. TenantCore lets you configure each mailbox from 1 to 25 sends per day.
Can the same mailbox work in Outlook and a sending tool?
Yes. TenantCore supports native Outlook access while the same mailbox is used with a compatible sending tool.
Does TenantCore keep mailbox credentials and MFA with the mailbox workflow?
Yes. Credentials, guided MFA, access, limits, and connection status stay tied to the mailbox instead of being tracked in separate notes.
01 / Product
What it helps you do
01
Create and manage mailboxes
Add mailboxes under a ready domain and keep their status easy to see.
02
Keep credentials and MFA close
Reveal or reset credentials and get the MFA code when you need it.
03
Set daily sending limits
Control how much each mailbox can send from TenantCore.
04
Keep Outlook access
Use the same mailbox with Outlook and your sending tool.
05
Keep access secure
Use guided MFA without adding another place to track the mailbox.
One mailbox view
Know how each mailbox is set up.
The details you need stay with the mailbox.
01
Credentials and MFA
02
Daily sending limit
03
Outlook access
04
Sending-tool connection status
Next step
Bring the work into one place.
Start a 14-day Plus trial with 1 tenant slot.