Client daemon to move mail from POP and IMAP to your local computer
Fetchmail is a mail retrieval daemon that can download messages from POP3, IMAP, ODMR and ETRN-based stores, with SSL/TLS security including certificate verification, and pass downloaded mail to a local SMTP or LMTP server, or a message delivery agent such as maildrop.
OneLDAP is a limited LDAP server that is a proxy to other common protocols, such as POP3 and IMAP. It provides basic SEARCH and BIND functions for standard LDAP authentication. It is based on the shell backend function of OpenLDAP. Release files are available at the project website.
IntraMail is a e-mail server, supporting POP3 and smtp, for internal - external use in your network. This program can download messages from multiple (external) accounts and with filters divided over your local mailboxes.
SIMON is a very simple MTA and POP3 implementation. It is completely designed from the ground up and is useful for departmental or small to medium sized companies.
CleanPOP de-spams and expires emails from a POP3 server based on matching emails in your local mbox file, so local anti-spam tools can be used to clean your remote inbox. It is also useful for fetchmail users, who have no option to *delete after X days*