I had the line
Set(@MailPlugins, ‘Auth::MailFrom’, ‘Auth::Crypt’);
in the RT_SiteConfig.pm of an RT 4.2.12 installation. When upgrading to 5.0.1 using these, the error message states that the latter is not forward compatible with RT 4.4. What should I use as MailPlugins instead in 5.0.1 to have the same functionality?