Queued up mail to the same host not delivered in one SMTP se…

I have watched exim deliver mail using

/usr/sbin/exim -d -q 0wNgCf-000340-00

It does not deliver messages in one session but delivers one message then
goes to some messages for other hosts and then comes back to the first
host.

The mail exploder is delivering backlogged mail from mailing lists and it
is highly likely that multiple e-mails are stacked up for a person!

/usr/sbin/exim -d -q

does the same.

Do I have to do anything to enable multiple deliveries to the same host?

Exim does deliver to multiple recipients on the same host within the same
message though.

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