Zoho automatically blocks accounts when it detects activity that could indicate a security risk or policy violation. Common reasons include:
Multiple failed login attempts
Logins from unfamiliar locations
Sending emails flagged as harmful or spam
Exceeding the maximum number of recipients per email
Going over your mailbox storage limit
Blocks are either temporary (auto-resolved after a period) or permanent (requires manual action). Learn more from Zoho
Check your inbox for a banner notification — Zoho usually displays the reason for the block along with an unblock link directly in your mailbox
Alternatively, visit the self-service unblock page: https://mail.zoho.com/UnblockMe
If the block was triggered by suspicious login activity, you'll need to change your password first before you can unblock the account
Log in to the Zoho Mail Admin Console (Use the URL for your region: Global · AU · EU · India)
In the left panel, go to Security & Compliance
Select Blocked Accounts
Choose Blocked Users or Blocked Groups depending on what's affected
Locate the account - it will appear under either Temporarily Blocked or Permanently Blocked
Hover over the email address and click the Unblock icon
To unblock multiple accounts at once, check the boxes next to each address and select Unblock from the top menu
Re-authenticate in Smartlead
Once the account is unblocked in Zoho, you'll need to reconnect it in Smartlead:
Go to Email Accounts in Smartlead
Find the affected Zoho account
Click Reconnect or Re-authenticate and follow the prompts
If the account is still showing as disconnected after completing these steps, contact Smartlead support.
