Add a META.yml to the distribution. Your buildtool should be able to autogenerate it.
Change the permissions of Build.PL/Makefile.PL to not-executable.
List all used modules in META.yml requires
Remove the POD errors. You can check for POD errors automatically by including Test::Pod to your test suite.
Error: MIME-Lite-3.01/changes.pod -- Around line 44: Unknown E content in E<#228> Around line 51: Unknown E content in E<#228>
Add a META.json to the distribution. Your buildtool should be able to autogenerate it.
Move your *.pm files in a directory named 'lib'. The directory structure should look like 'lib/Your/Module.pm' for a module named 'Your::Module'. If you need to provide additional files, e.g. for testing, that should not be considered for Kwalitee, then you should look at the 'provides' map in META.yml to limit the files scanned; or use the 'no_index' map to exclude parts of the distribution.
Define the license if you are using in Build.PL. If you are using MakeMaker (Makefile.PL) you should upgrade to ExtUtils::MakeMaker version 6.31.
Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.
Error: MIME::Lite, MailTool