Insightly Email Sync Not Working

How to fix it

Try these in order — the most common fix is first.

1. 1. Reconnect the mailbox

   Copy steps
   1. Click your profile > User Settings
   2. Open the email/Gmail or Office 365 integration section
   3. Disconnect the account, then connect again and accept all permissions
   4. Send a test email to a known contact
   Did this fix it? Yes No

2. 2. Check admin app access

   Copy steps
   1. Ask your Google Workspace or Microsoft 365 admin to allow Insightly in third-party app access
   2. Confirm 2-step verification or conditional access is not blocking the sign-in
   Did this fix it? Yes No

3. 3. Match the contact

   Copy steps
   1. Make sure the email address exists on a contact record
   2. Move test emails to Inbox or Sent, not subfolders
   Did this fix it? Yes No

Symptoms

Sent or received emails no longer appear on contact or opportunity records.

Why it happens

• Expired or revoked OAuth token (password change, security policy)
• Admin restricts third-party app access
• Emails are in subfolders or labels the sync does not read
• Sender address is not on any contact record

This guide also covers

• insightly email sync not working
• insightly gmail sync
• insightly office 365 email

The same problem in other apps

All sync failures guides →

• HubSpot Salesforce Sync Errors (HubSpot)
• Salesforce Einstein Activity Capture Not Syncing (Salesforce)
• Pipedrive Email Sync Not Working (Pipedrive)
• Zoho CRM Email Not Syncing (IMAP/Gmail) (Zoho CRM)
• Freshsales Email Not Syncing (Freshsales)

Other Insightly errors

• Insightly Gmail and Outlook Add-in Not Working
• Insightly Import Failed
• Insightly Workflow Automation Not Triggering
• Insightly Mobile App Not Syncing
• Insightly Login Problems
• Insightly Calendar Sync Not Working
• Insightly Record Limit Reached
• Insightly Slow or Not Loading