How to Fix Virtualmin Webmail Error “An error occurred listing mail in this folder : Failed to connect to localhost:143 : Connection refused” on Centos

I’m new to Virtualmin hosting control panel and I got this error message when login to webmail via https://domain.com:20000

An error occurred listing mail in this folder : Failed to connect to localhost:143 : Connection refused

This problem happens when Dovecot IMAP and POP3 service is not started. So I start the service and problem solved.

# /etc/init.d/dovecot start

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