Outlook: Error Message: An Unknown Error Has Occurred

Email | Updated 2026
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.

  • 369 Users Found This Useful

Was this answer helpful?

Related Articles

What URL should my users go to to get their webmail - I don't want them to log in to the control panel just to get their email

Email & Webmail | Updated 2026 You can access webmail for your hosting account from any...

Sent Emails Not Showing in Sent Folder

Email & Webmail | Updated March 2026 If you send an email from your desktop or phone but...

Outlook: Error Message: 0x800CCC0B

Email | Updated 2026 Quick Answer This error typically means Outlook lost its connection...

IP Address Has Changed Error in Webmail

Email & Webmail | Updated March 2026 The "IP Address Has Changed" error in Webmail is a...

Error 503 Valid RCPT Command Must Precede DATA

Email & Webmail | Updated March 2026 The error "503 valid RCPT command must precede DATA"...



Save 30% on web hosting - Use coupon code Hosting30