Know How To Resolve Error 421 In Outlook

About Error 421

Microsoft Outlook is one of the popular email client services used by corporate as well as home users for sending and receiving emails. A connection to Outlook Express using POP3 server requires some changes in the server settings of Microsoft Exchange server. So this probably may cause error 421 when you send and receive emails via POP3 server.

  

        

The error code of the error 421 is shown below :

“An unknown error has occurred: Server error 421”

“An unknown error has occurred. Subject ‘Testing’, Account: ‘pop.charter.net’, Server: ‘mail.charter.net’, Protocol: SMTP, Server Response: ‘421 Message rejected’, Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67”

On having this error code, Outlook users cannot access mails, calendars, events, tasks, etc.

Reasons behind Error 421

• Improper settings in the exchange server
• coordinate or damaged Pst files in Outlook
• Incorrect Outlook account settings
• Virus infection
• Little space in system memory
• Malfunctioning of OS
• Slow internet connection

Symptoms of the Error 421

• Prohibit from sending and receiving emails
• PC will slow down
• start up problems
• Outlook program running extremely slow and not responding
• Resolution for Error 421

It is a fatal error that is harmful and may remove all your crucial data from PST file and even crash Outlook application. Therefore, you need to download a third party repairing tool. PST Repair tool that can fix almost all the PST and Outlook issues.