This file is indexed.

/etc/gosa/sieve-mailsize.txt is in gosa-plugin-mail 2.7.4+reloaded1-1.

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

The actual contents of the file can be viewed below.

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#  Reject mails with bigger size
if size :over {$maxsize}M{
        reject text:
Dear sender,

the mail you sent to our mailsystem has been rejected due
to a user configured maximum mail size ($maxsize MB).

Either ask the user to remove the sizelimit, or send smaller pieces.

Thank you,
 the mailserver
.
        ;
        stop;
}