end
smtp4allowed.length == 0 and smtp4allowed << '0.0.0.0/0'
-smtp6allowed.length == 0 and smtp6allowed << '::'
+smtp6allowed.length == 0 and smtp6allowed << '::/0'
out << "@def $SMTP_SOURCES = (#{smtp4allowed.join(' ')});"
out << "@def $SMTP_V6_SOURCES = (#{smtp6allowed.join(' ')});"