Q0410

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How can I make Exim look in the alias NIS map instead of /etc/aliases?

The default configuration does not use NIS (many hosts don't run it). You need to change this line in the system_aliases router:

data = ${lookup{$local_part}lsearch{/etc/aliases}}

Change it to

data = ${lookup{$local_part}nis{mail.aliases}}

If you want to use /etc/aliases as well as NIS, put this router (with a different name) before or after the default one, depending on which data source you want to take precedence.