[exim] Air gapped intranet?

[Angus March]

I don't have a lot of experience w/MTAs. How is Exim on an air gapped
intranet? If the network is small enough, can we dispense w/DNS servers?
-- 
## List details at https://lists.exim.org/mailman/listinfo/exim-users
## Exim details at http://www.exim.org/
## Please use the Wiki with this list - http://wiki.exim.org/