listen on lo0

<% if @smtpd_relay -%>
accept from local for any relay via <%= @smtpd_relay %><% if @mail_domain %> as "@<%= @mail_domain %>"<% end %>
<% else -%>
table aliases db:/etc/mail/aliases.db

accept from local for local alias <aliases> deliver to mbox
accept from local for any relay<% if @mail_domain %> as "@<%= @mail_domain %>"<% end %>
<% end -%>