gentoo-overlay/mail-mta/qpsmtpd/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>net-mail</herd>
<maintainer>
  <email>jokey@gentoo.org</email>
  <name>Markus Ullmann</name>
</maintainer>
<use>
        <flag name='async'>Add deps + support for asynchronous mail reception/processing as well as preforked daemon</flag>
        <flag name='postfix'>create user with permissions for proper postfix interaction</flag>
</use>
</pkgmetadata>