[exim] Immediate and queued SMTP delivery.

In a "normal" configuration, Exim immediately tries to deliver all
messages it receives, so if it receives several messages that need to
be relayed it will open enough parallel SMTP connections at the same
time. As I understand the spec, it is impossible to impose a general
limit on simultaneous connections without using queue_only -- is that
correct?

Also, is this
queue_domains = /path/to/domains.list
valid if the file is a newline-delimited list of domains?

Thanks,
Adam