To install Mail::SpamAssassin::Plugin::OpenPGP, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Mail::SpamAssassin::Plugin::OpenPGP
CPAN shell
perl -MCPAN -e shell install Mail::SpamAssassin::Plugin::OpenPGP
For more information on module installation, please visit the detailed CPAN module installation guide.