NAME

Email::MessageID - Generate world unique message-ids.

SYNOPSIS

  use Email::MessageID;

  my $mid = Email::MessageID->new;

  print "Message-ID: $mid\x0A\x0D";

DESCRIPTION

Message-ids are optional, but highly recommended, headers that identify a message uniquely. This software generates a unique message-id.

Methods

new

  my $mid = Email::MessageID->new;

  my $new_mid = Email::MessageID->new( host => $myhost );

This class method constructs an Email::Address object containing a unique message-id. You may specify custom host and user parameters.

By default, the host is generated from Sys::Hostname::hostname.

By default, the user is generated using Time::HiRes's gettimeofday and the process ID.

Using these values we have the ability to ensure world uniqueness down to a specific process running on a specific host, and the exact time down to six digits of microsecond precision.

There are two triggers for this method. After the user has been initialized or generated, the create_user trigger is invoked with a reference to the user value as the second argument. You can create a trigger with the add_trigger method.

  Email::MessageID->add_trigger( create_user => sub {
      my ($class, $user) = shift;
      $$user .= ".my-special-app-name";
  } );

There is an identical trigger invoked for the host, receiving the host value's reference as the second argument. This trigger is called create_host.

  Email::MessageID->add_trigger( create_host => sub { ... }  );

SEE ALSO

Email::Address, Time::HiRes, Sys::Hostname, perl.

AUTHOR

Casey West, <casey@geeknest.com>.

COPYRIGHT

  Copyright (c) 2004 Casey West.  All rights reserved.
  This module is free software; you can redistribute it and/or modify it
  under the same terms as Perl itself.