/etc/logcheck/ignore.d.server/libsasl2-modules is in libsasl2-modules 2.1.27~101-g0780600+dfsg-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | \w{3} [ :0-9]{11} [._[:alnum:]-]+ [._[:alnum:]-]+: DIGEST-MD5 common mech free
|