programming-examples/perl/String/Format by here string.pl

#!/usr/bin/perl

use warnings;
use strict;

print format_email('me@m.net', 'y@y.org', "Wishing","message!", "Regards, Me");

sub format_email {
    my ($me, $to_addr, $subject, $body_of_message, $signature) = @_;

    return <<_EMAIL_
            To: $to_addr
            From: $me
            Subject: $subject
            $body_of_message
            --
            $signature
            _EMAIL_;
}