Plain Text Emails:

use Email::Simple;
use Email::Sender::Simple qw(sendmail);

my $email = Email::Simple->create(
  header => [ From => "", To => "", Subject => "" ],
  body   => $message,
);
sendmail($email);
[download]

HTML Emails (MIME::Lite::HTML will handle attaching images, css, ...):

use MIME::Lite;
use MIME::Lite::HTML;
use HTML::FormatText::WithLinks;

Send(
    { From => "", To => "", Subject => "" },
    $html_message
);

sub Send {
  state $mk_text = HTML::FormatText::WithLinks->new();
  my ($opt, $html, $text) = @_;
  $text ||= $mk_text->parse($html);

  my $ml = MIME::Lite::HTML->new(
    TextCharset => 'UTF-8',
    TextEncoding => 'base64',
    HTMLCharset => 'UTF-8',
    %$opt,
  );
  my $m = $ml->parse($html,$text);
  my @errors;
  die "@errors" if @errors = $ml->errstr;
  $m->send;
}
[download]