Package: libsbuild-perl Version: 0.73.0-4 Severity: normal libsbuild-perl Recommends: exim4 | mail-transport-agent
This seems excessive as I suspect most people use sbuild to build packages locally and don't need it to send mail. Please consider downgrading it to a Suggests. The dependency should probably also be moved to the application that will actually send mails (either sbuild or buildd) to be easier to discover. Ansgar