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=encoding utf8

=head1 NAME

Mail::Server - Base class for email servers in MailBox

=head1 INHERITANCE

 Mail::Server
   is a Mail::Reporter

 Mail::Server is extended by
   Mail::Server::IMAP4

=head1 SYNOPSIS

 my $server = Mail::Server::IMAP4->new($msg);
 my $server = Mail::Server::POP3->new($msg);

=head1 DESCRIPTION

This module is a place-holder, logical in the class hierarchy.  On the
moment, no full server has been implemented, but some parts of IMAP4
exist.

Servers:

=over 4

=item * L<Mail::Server::IMAP4|Mail::Server::IMAP4>

Partial IMAP4 implementation.

=back

Extends L<"DESCRIPTION" in Mail::Reporter|Mail::Reporter/"DESCRIPTION">.
 
=head1 METHODS

Extends L<"METHODS" in Mail::Reporter|Mail::Reporter/"METHODS">.
 
=head1 DETAILS

# This file contains parts which could be used for doc

* Labels

Labels are flags which come with a message.  Usually: old, seen, replied,
flagged, and trashed.

The folder-types differ how they store label information.  Mbox folders
use the Status and X-Status fields, MH folders keep a separate labels
file called .mh_sequences, and Maildir folders put the labels in the
name of the file.

Keeping the labels right is quite complicated.  The `[X-]Status' header
lines are only immediately updated with Mbox messages which will cause
them to be written.  Those lines are ignored for MH and Maildir, however
updated when a new version of such a message has to be written to
file.

The reason behind the MH/Maildir way of storing labels is pure
performance: labels are often needed.  Opening each message to see
how the labels are set is cheap for Mbox, which has to read the whole
folder on opening anyway, but terribly expensive for directory
origanized folders (as MH and Maildir) which need to take every
single message from a separate file.

Often used labels:
  draft     to be transmitted
  trashed   to be deleted
  flagged   selected
  current   last used
  replied   a response message was constructed
  seen      handled by the user
  old       existence of message seen by user in the previous opening
            of the folder.

=head1 DIAGNOSTICS

=over 4

=item Error: Package $package does not implement $method.

Fatal error: the specific package (or one of its superclasses) does not
implement this method where it should. This message means that some other
related classes do implement this method however the class at hand does
not.  Probably you should investigate this and probably inform the author
of the package.

=back

=head1 SEE ALSO

This module is part of Mail-Box distribution version 3.004,
built on December 22, 2017.

Do not forget to read
L<Mail::Box-Overview>,
L<Mail::Box-Cookbook>, and
L<Mail::Box-Index>.
Examples are included in the Mail-Box distribution, directories 'examples'
and 'scripts'.

Browseable manuals, papers, and other released material van be found
at  Website: F<http://perl.overmeer.net/mailbox/>

The central modules (in separate distributions) in the MailBox suite are:
L<Mail::Message>,
L<Mail::Box>,
L<Mail::Box::IMAP4>,
L<Mail::Box::POP3>,
L<Mail::Box::Parser::C>,
L<Mail::Box::Dbx> (unpublished),
L<Mail::Transport>,
L<Object::Realize::Later>, and
L<User::Identity>.

Please post questions or ideas to the author F<markov@cpan.org>.

=head1 LICENSE

Copyrights 2001-2017 by [Mark Overmeer]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See F<http://dev.perl.org/licenses/>