NAME

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

SYNOPSIS

         use Email::MessageID;

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

         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.

   create_host
         my $domain_part = Email::MessageID->create_host;

       This method returns the domain part of the message-id.

   create_user
         my $local_part = Email::MessageID->create_user;

       This method returns a unique local part for the message-id.  It includes some random data
       and some predictable data.

   in_brackets
       When using Email::MessageID directly to populate the "Message-ID" field, be sure to use
       "in_brackets" to get the string inside angle brackets:

         header => [
           ...
           'Message-Id' => Email::MessageID->new->in_brackets,
         ],

       Don't make this common mistake:

         header => [
           ...
           'Message-Id' => Email::MessageID->new->as_string, # WRONG!
         ],

SEE ALSO

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

PERL EMAIL PROJECT

       This module is maintained by the Perl Email Project.

       <http://emailproject.perl.org/wiki/Email::MessageID>

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.