Outlook Error

How To Fix Outlook Error Code 451?

This error occurs when trying to send emails and as a result sender’s email client gets connected to the sender’s mail server. Fix Outlook Error Code 451 by applying appropriate remedies available at our end. However this mail server will connect to recipient’s mail server over internet while transmitting the email. However the mail once accepted by a recipient mail server will reach at recipient’s inbox where they will then download their mail via an email client.

Steps to Fix Outlook Error 451 are as follows

Fix Outlook Error Code 451

The domain should have MX records set into a local mail servers as suggested by Outlook Email Support technical team.

Let us say for example, the domain should have an entry process in the file “/etc/localdomains in cPanel Exim servers’.

  • Well the MX record for the domain should be accurately verified while ensuring that the primary mail server is set on priority of 0 and the MX is set the correct server.
  • Permission and ownership errors of /etc and mail folders as well as other settings in the mail server configuration file can however lead to this error.
  • So, have a check on the database connectivity as well as file permissions process to fix Outlook email 451 error.
  • Perform a deep check of all log messages, MX records, configuration files, permissions and ownership, to easily pinpoint the root cause.

I hope all the above steps will help users rectify the cause of this error. But still we recommend users to connect us at below mentioned details.

Related Post: How to Fix Outlook Error Code 550?

Why customers should approach our tech support solutions?


  • Award winning tech support solutions
  • Small enough to care but large enough to manage every technical fault
  • Trusted advice with future effective solutions
  • We add value to your solutions not complications
  • Expert team is always ready to assist you in every possible manner
  • We have unique solutions for the assistance
  • 24/7*365 days service

For more such issues, connect with our tech support engineers and solve the error code!

Call us at Outlook Support Phone Number where customers are brought flexible and the safest ever solutions. We are available 24/7 hours to assist users in all types of issues with solutions available at our end. Feel free to connect with us and get the most effective remedies for related queries. Our solutions are matched as per the latest industry trends. So, explore our industry matched solutions at your desk.