One of our customers requested for a pop server connection and I started searching for a pop server which is capable of working with sendmail already running in his server. He had a server without control panel, with Red Hat Linux release 9 (Shrike). The research ended up with the term Dovecot.
This article describes how to install the Dovecot mail server from source as an imap / pop3 mail server, and how to set up the sieve plugin so that the customers can use the sieve mail filtering language for their mail accounts.
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This article explains how to migrate email accounts/mailboxes from a sendmail server to a Qmail server. A challenging task for any sysadmin implementing a Migration would be to migrate all the email accounts from one Mail server to another preserving all the settings, such as usernames and passwords.
This document helps you, only if your Qmail system is installed with VpopMail (not VmailMgr). Installing and configuring qmail+vpopmail is out of the scope of this article.(Refer to qmailrocks.org and lifewithqmail.org to install Qmail and Vpopmail) This article exclusively covers only the Migration aspects.
Here is what you have.
* Sendmail server, the list of usernames, the corresponding system passwords (encrypted, not clearpasswords) and the Mailboxes
* Qmail server with VpopMail.