In case a list of items (iterable) is passed to the set_parameter
function in main.cf, the list of items are joined by a comma.
This makes parameters with many items a bit hard to read as it
results in long lines.
Postfix also supports an alternative declaration where subsequent
parameter values are written in a new line that starts with whitespace
and thus forms a continuation of the previous line.
This makes parsing multiple entry lines easier for humans.
Old style:
smtpd_milters = { unix:/run/spamass-milter/postfix/sock, connect_timeout=10s, default_action=accept } { inet:localhost:10003, connect_timeout=10s, default_action=accept } { inet:localhost:10004, connect_timeout=10s, default_action=accept } { inet:localhost:10006, connect_timeout=10s, default_action=accept } { inet:localhost:10007, connect_timeout=10s, default_action=accept }
New style:
smtpd_milters = { unix:/run/spamass-milter/postfix/sock, connect_timeout=10s, default_action=accept }
{ inet:localhost:10003, connect_timeout=10s, default_action=accept }
{ inet:localhost:10004, connect_timeout=10s, default_action=accept }
{ inet:localhost:10006, connect_timeout=10s, default_action=accept }
{ inet:localhost:10007, connect_timeout=10s, default_action=accept }
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