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A tool that displays the status of your mailbox/maildir and notifies you when new mail has arrived. It was designed to be used with the Blackbox window manager but should work with any window manager.

This module determines whether an email address is well-formed, and optionally, whether a mail host exists for the domain. Please note that there is no way to determine whether an address is deliverable without attempting delivery.

C-client is a common API for accessing mailboxes. It is used internally by the popular PINE mail reader as well as the University of Washington's IMAP server. For more information, please see the UW IMAP homepage:

This plugin allows saving outgoing addresses to a designated folder in the address book. Addresses are saved only if not found in the address book to avoid unwanted duplicates.

This plugin is intended to extend the filtering possibilities of Claws Mail. It provides a Perl interface to Claws Mail' filtering mechanism, allowing the use of full Perl power in email filters.

Addresses for GNUstep is a versatile address book application for managing contact information. It stores addresses, phone numbers, pictures, instant messaging information, email, homepages and whatever. LICENSE: LGPL2 or later

bmf is an extremely efficient Bayesian mail filter based on Paul Graham's article, "A Plan for Spam." It's fast, small, efficient, and more versatile than other Bayesian filters.

Couriergraph is a very simple mail statistics RRDtool frontend for Postfix that produces daily, weekly, monthly and yearly graphs of Courier's POP3, IMAP, POP3s and IMAPs logins.

ENMA is a milter program for the domain authentication technologies. It authenticates sender's address with SPF and Sender ID, then labels the result onto the Authentication-Results: field.

ezmlm is an easy-to-use, high-speed mailing list manager for qmail. ezmlm lets users set up their own mailing lists within qmail's address hierarchy. A user, Joe, types ezmlm-make ~/SOS ~/.qmail-sos joe-sos isp.net and instantly has a functioning mailing list, joe-sos@isp.net, with all relevant information stored in a new ~/SOS directory. ezmlm takes advantage of qmail's VERPs to reliably determine the recipient address and message number for every incoming bounce message. ezmlm is reliable, even in the face of system crashes. It writes each new subscription and each new message safely to disk before it reports success to qmail. ezmlm doesn't mind huge mailing lists. Lists don't even have to fit into memory. ezmlm hashes the subscription list into a set of independent files so that it can handle subscription requests quickly. ezmlm uses qmail for blazingly fast parallel SMTP deliveries.