Courier-IMAP: www.inter7.com/courierimap
Exim: www.exim.org
GQ: biot.com/gq
IMP: www.horde.org/imp
iPlanet Directory Server: www.iplanet.com/products/iplanet_directory/home_directory.html
iPlanet Directory Server 5.1 Deployment Guide: docs.iplanet.com/docs/manuals/directory/51/html/deploy/contents.htm
Jamm: jamm.sourceforge.net
Keith's GQ Patches: www.kgarner.com/code
Novell eDirectory: www.novell.com/products/edirectory
OctetString: octetstring.com
OpenLDAP: www.openldap.org
Postfix: www.postfix.org
Procmail: www.procmail.org
Qmail: www.qmail.org
QmailAdmin: www.inter7.com/qmailadmin
Qmail-LDAP: www.nrg4u.com
vpopmail: www.inter7.com/vpopmail
Sendmail: www.sendmail.org
SquirrelMail: www.squirrelmail.org
University of Washington IMAP Web Site: www.washington.edu/imap