Error connecting to imap server localhost

When i am opening webmail, i am getting this error message "error connecting to imap server localhost. 111 connection refused"

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When you log on to the server with SSH and execute the following command, you should get a result like so:

netstat -tulpn | grep :143   tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 1201/dovecot tcp6 0 0 :::143 :::* LISTEN 1201/dovecot

If you get nothing, try service dovecot start. Does that work?