git clean -xfd DIST_BUILD=1 perl Makefile.PL make manifest make dist
To install RT::Interface::Email::RequiredHeaders, copy and paste the appropriate command in to your terminal.
cpanm
cpanm RT::Interface::Email::RequiredHeaders
CPAN shell
perl -MCPAN -e shell install RT::Interface::Email::RequiredHeaders
For more information on module installation, please visit the detailed CPAN module installation guide.