Email | Updated 2026
Quick Answer
Error -23012 indicates a network-level connection failure between Outlook and the mail server. Verify your internet connection is working, confirm the server is mail.yourdomain.com, and try switching to SSL ports (POP3: 995, IMAP: 993, SMTP: 465). If the issue persists, your IP may be temporarily blocked by the firewall.
For complete Outlook troubleshooting steps and all error codes, see our full guide:
Correct Email Settings
Most Outlook errors are caused by incorrect server settings. Use these values:
- Incoming/Outgoing Server -
mail.yourdomain.com - POP3 Port - 995 (SSL) or IMAP Port - 993 (SSL)
- SMTP Port - 465 (SSL)
- Username - your full email address
- Authentication - enabled for outgoing, SPA disabled
For step-by-step setup: How to Set Up Email in Microsoft Outlook
This article has been consolidated into our Common Outlook Email Errors guide for easier reference.
