GNU Mail abstraction library

 GNU Mailutils is a rich and powerful protocol-independent mail framework.
 It contains a series of useful mail libraries, clients, and servers.
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 This is GNU's Mail abstraction library. This library allows programs to
 hook into a single library for many different types of mail backends.
 The following backend stores are currently provided: mbox, mh, maildir,
 dotmail, pop3, imap4.