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.
my $transport = Email::Sender::Util->easy_transport($class => \%arg);
This takes the name of a transport class and a set of args to new. It returns an Email::Sender::Transport object of that class.
$class is rewritten to "Email::Sender::Transport::$class" unless it starts with an equals sign ("=") or contains a colon. The equals sign, if present, will be removed.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.