postfix-formula/postfix/files/mapping.j2

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# Managed by config management
{% if data is mapping -%}
{% for key, value in data.iteritems() -%}
{# Some settings, like virtual_alias_maps can take multiple values. Handle this case. -#}
{% if value is iterable and value is not string -%}
{% for item in value -%}
{{ key }} {{ item }}
{% endfor -%}
{% else -%}
{{ key }} {{ value }}
{% endif -%}
{% endfor -%}
{% else -%}
{# Some settings need order, handle OrderedDict -#}
{% for item in data -%}
{{ item.keys()[0] }} {{ item.values()[0] }}
{% endfor -%}
{% endif -%}