metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="person">
    <email>gentoo_bugs_peep@parallaxshift.com</email>
    <name>Philippe Chaintreuil</name>
  </maintainer>

  <maintainer type="person">
    <email>bug@mejor.pl</email>
    <name>Marcin Mirosław</name>
  </maintainer>

  <maintainer type="person">
    <email>mjo@gentoo.org</email>
    <name>Michael Orlitzky</name>
  </maintainer>

  <maintainer type="project">
    <email>proxy-maint@gentoo.org</email>
    <name>Proxy Maintainers</name>
  </maintainer>

  <use>
    <flag name="bayes">
      Require a database (MySQL, SQLite, Postgres, or BerkDB) backend
      to enable the Bayesian filtering database. If you use the Redis
      backend, you do not need to enable this flag (Redis support is
      enabled automatically, and has no external dependencies).
    </flag>
    <flag name="cron">
      Install a cron job to update SpamAssassin's rules daily.
    </flag>
    <flag name="qmail">Build qmail functionality and docs</flag>
  </use>
</pkgmetadata>