Close CRM Outlook / Office 365 Not Sending or Syncing

How to fix it

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

1. 1. Enable Authenticated SMTP

   Copy steps
   1. Open the Microsoft 365 admin center
   2. Select the user > Mail > Manage email apps
   3. Tick Authenticated SMTP and save
   4. Wait about 30 minutes
   Did this fix it? Yes No

2. 2. Reconnect in Close

   Copy steps
   1. Settings > Accounts & Apps
   2. Click Reconnect on the Microsoft account
   3. Accept the permissions prompt (it now includes calendar access)
   Did this fix it? Yes No

3. 3. Check address match and IMAP

   Copy steps
   1. Confirm the primary email and username in Microsoft match the address in Close
   2. Make sure IMAP is enabled for the user
   Did this fix it? Yes No

Symptoms

Office 365 account disconnects when sending; sent emails missing from the Outlook Sent folder.

Why it happens

• Authenticated SMTP disabled for third-party apps
• IMAP disabled for the user
• Primary address or username in Microsoft differs from the address added to Close

This guide also covers

• close crm outlook not syncing
• close office365 smtp
• close crm outlook not sending

The same problem in other apps

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