Currently smartmontools with "daemon" use flag depends on virtual/mailx which provides MUA functionality. I suppose smartmontools never needs to receive mail, so instead depending on virtual/mta would make more sense. Reproducible: Always Steps to Reproduce: 1. emerge ssmtp 2. configure ssmtp 3. echo 'sys-apps/smartmontools daemon' > /etc/portage/package.use/smartmontools 4. emerge smartmontools Actual Results: mailutils (virtual/mailx) gets pulled in even though a working MTA is already present. Expected Results: smartmontools using ssmtp to send mail and not installing a parallel mail infrastructure.