Fix cPanel Webmail Error: Unexpected condition from IMAP server, closed or corrupt connection to IMAP. Possible mailbox corruption.

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Hello Friends,

In this post, we will fix the issue with cPanel Webmail Error.

cPanel provides a webmail interface for users through which they can login their email account and send/receive emails. Email activity on cPanel servers are handled by Exim and Dovecot.

Sometime, when you open Webmail, you will get the below error message:

Unexpected condition from IMAP server, closed or corrupt connection to IMAP. Possible mailbox corruption.

The cause for this error is that Dovecot index file for a particular email account is now corrupted.

There is a very simple fix for this issue. Please follow the below mentioned steps one by one fix it:

Step 1: Login to your server via SSH and browse to the following location by running the below mentioned command [replace username and domain.com with your actual username and domain name].

cd /home/username/mail/domain.com/

Step 2: Run list files command [ls -la] and you should notice that every email account has an associated directory here.

Step 3: Now go to the directory of the email account showing mailbox corruption error , run [ls –la] command and you will be able to see dovecot.index file here.

This file dovecot.index is corrupted and causing the issue.

Step 4: Now rename it by running the following command.

mv dovecot.index dovecot.index-badcopy

Once done, relogin into the webmail interface, your webmail systems should work fine now. 🙂

NOTE: Webmail creates this file automatically on login.

Feel free to write a comment on this.

Thank you.

My name is Shashank Shekhar. I am a Software Engineer, currently working in one of the leading web-hosting companies in India. I am having 2 years of experience in Linux Server Administration.

I love to work in Linux environment & love learning new things.

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