/usr/share/aide/config/aide/aide.conf.d/31_aide_exim4 is in aide-common 0.15.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | /var/spool/exim4/gnutls-params$ VarFile
/var/spool/exim4/db/(wait-remote_smtp(_smarthost)?|retry|callout)$ VarFile
!/var/spool/exim4/input/[a-zA-Z0-9]{6}-[a-zA-Z0-9]{6}-[a-zA-Z0-9]{2}-[DHJ]$
!/var/spool/exim4/msglog/[a-zA-Z0-9]{6}-[a-zA-Z0-9]{6}-[a-zA-Z0-9]{2}$
!/var/spool/exim4/gnutls-params$
!/var/spool/exim4/.rnd$
/var/spool/exim4(/(input|msglog|scan))?$ VarDir
/var/lib/exim4/config.autogenerated$ VarFile
/@@{RUN}/exim4/exim.pid$ VarFile
/var/lib/exim4$ VarDir
/@@{RUN}/exim4$ VarDirInode
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