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Overview

TenantCore does not connect to Smartlead directly. The integration happens at the mailbox level you retrieve credentials from TenantCore and enter them into Smartlead as email accounts.

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Prerequisites

  • At least one mailbox provisioned in TenantCore with a Verified domain status
  • A Smartlead account with available email account slots

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Step 1 — Retrieve Mailbox credentials from TenantCore

  1. Open the TenantCore app and navigate to the Mailboxes page.
  2. Find the mailbox you want to connect
  3. Copy the credentials

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Step 2 — Add the email account in Smartlead

  1. In Smartlead, go to Email Accounts
  2. Click Add Account and select Outlook or Microsoft 365
  3. Sign in with your Outlook credentials and click “Accept” when asked for permissions. This utilizes secure OAuth.
  4. Once the status shows “Connected,” your mailbox is ready for warm-up or campaigns.

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Step 3 — Configure send limits in Smartlead

Set your Smartlead per-account send limit at or below the limit enforced in TenantCore. If Smartlead attempts to exceed the TenantCore limit, Exchange will block the excess messages and Smartlead may log delivery errors.
In Smartlead, open the email account settings and set:
  • Daily sending limit — match this to the TenantCore mailbox limit or set it lower
  • Sending schedule — distribute sends across business hours rather than sending in bursts
The TenantCore limit is the hard ceiling. Smartlead’s limit is a scheduling guide. Keeping them aligned avoids unnecessary NDRs and delivery errors in Smartlead’s logs.

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Repeat for each mailbox

Add each TenantCore mailbox as a separate email account in Smartlead. If you’re managing multiple clients, use Smartlead’s workspace or tagging features to keep client mailboxes organized.

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Troubleshooting

Smartlead verification fails
  • Confirm the mailbox password was copied correctly, passwords are case-sensitive
  • Check that the domain’s DNS records have propagated and the domain shows as healthy in TenantCore
  • Confirm the mailbox status is Active in TenantCore
Delivery errors after connecting
  • If messages are being blocked, the Smartlead send limit likely exceeds the TenantCore mailbox limit
  • Reduce Smartlead’s daily limit to match or fall below the TenantCore limit