Fix Outlook Error 421 Message Rejected Error

Microsoft Outlook is used by the users to maintain entire documents safely. But sometimes this happens that in Outlook many critical error and corruption arises and due to this reason it is required to take external help. Due to this reason the performance of Outlook fails. And due to this reason user come across Outlook Error 421 “Message Rejected”. Due to this error message user becomes Unable to send group mail in Outlook. Along with this user also send mail to single recipient but when they want to send it in group then below mentioned error message arises:

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

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The main reason behind Outlook Error 421 Message Rejected Error message might be external and some of them might be internal. This error message arises due to ISP settings, firewall settings, slow internet connections, registry corruption and PST problem. So to fix Outlook Error 421 message rejected error, user will have to check entire problem one by one. The first reason is Internet Service limited account facility. Secondly your ISP server that might be blocked for your bulk-email by taking it spamming. Due to this reason user will only be able to send email to single recipient at one time and will not be able to use chart address.

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You will get troubled in Outlook PST file if you have business account, while you send or receive email through Outlook then an acknowledgement and messages are saved in PST file. And in case PST file is working slowly then this will reject the bulk request and will allow only a single request at a single time. So to fix this problem user can try inbuilt Inbox repair tool, but in case this utility fails then you can try third party Outlook PST Repair Tool. This tool has powerful algorithm that performs advanced scanning and then repair the error message easily.