[ubuntu] Setting up email server: Webmin, Dovecot, Postfix

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http://ubuntuforums.org – I need some help again with the mail server setup. I have managed to get the server to send email from the website, but I would like to setup some mail accounts to receive mail too. I'm using Webmin, Dovecot, Postfix and Squirrelmail. I have installed those, but when I try to login to one of the email accounts from Squirrelmail I get this error. Quote: ERROR: Connection dropped by IMAP server. and when I try to send an email to this account I get this Quote: Delivery to the following recipient failed permanen (Hardware)