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/usr/etc/ipop3d
popd is normally invoked by the Internet server (see the inetd(1Mtcp) manual page) for requests to connect to the POP port as indicated by the /etc/services file (see the services(4tcp) manual page).
The POP2 and POP3 protocols are intrinsically less flexible than IMAP (see the imapd(1M) manual page) and do not maintain ``read'' vs ``unread'' states on the server. As a result, most POP-based software transfers all the mail from the server to the client and deletes it from the server. This necessarily locks the user into using only a single client.
POP3 does not allow you to specify an alternate folder from the user's default.