This file is indexed.

/etc/mail/address.resolve is in sendmail-base 8.14.4-8+deb8u2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# addresses to be delivered locally
root
postmaster
user
user@mailhub
user@mailhub.gadget.com
user@gadget.com

# Addresses to be forwarded with SMTP to firewall
user@firewall
user@firewall.gadget.com

# Addresses to be forwarded with SMTP to harker.com
user@harker.com
harker!user