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Email::Thread(3pm) User Contributed Perl Documentation Email::Thread(3pm)


Email::Thread - Use JWZ's mail threading algorithm with Email::Simple objects


version 0.713


    use Email::Thread;
    my $threader = Email::Thread->new(@messages);
    dump_em($_,0) for $threader->rootset;
    sub dump_em {
        my ($self, $level) = @_;
        debug (' \\-> ' x $level);
        if ($self->message) {
            print $self->message->header("Subject") , "\n";
        } else {
            print "[ Message $self not available ]\n";
        dump_em($self->child, $level+1) if $self->child;
        dump_em($self->next, $level) if $self->next;


Strictly speaking, this doesn't really need Email::Simple objects. It just needs an object that responds to the same API. At the time of writing the list of classes with the Email::Simple API comprises just Email::Simple.

Due to how it's implemented, its API is an exact clone of Mail::Thread. Please see that module's documentation for API details. Just mentally substitute "Email::Thread" everywhere you see "Mail::Thread" and "Email::Thread::Container" where you see "Mail::Thread::Container".


This module should work on any version of perl still receiving updates from the Perl 5 Porters. This means it should work on any version of perl released in the last two to three years. (That is, if the most recently released version is v5.40, then this module should work on both v5.40 and v5.38.)

Although it may work on older versions of perl, no guarantee is made that the minimum required version will not be increased. The version may be increased for any reason, and there is no promise that patches will be accepted to lower the minimum required perl.


Simon Cozens (SIMON) for encouraging me to release it, and for Email::Simple and Mail::Thread.

Richard Clamp (RCLAMP) for the header patch.


perl, Mail::Thread, Email::Simple


Iain Truskett <>


Ricardo Signes <>


This software is copyright (c) 2003 by Iain Truskett <>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

2022-11-21 perl v5.36.0