DKIM read error, can this be ignored?

[Richard G]

In the /var/log/exim/paniclog these lines seen to appear fairly regularly:

2020-02-03 23:37:54 1iykLo-00036e-Cl unable to open file for reading: /etc/virtual/server.domain.com/dkim.private.key
2020-02-04 02:43:17 1iynF4-0006ng-Bd unable to open file for reading: /etc/virtual/server.domain.com/dkim.private.key

This key does indeed not exist. But this is the hostname.

Should this key exists or is this caused by bruteforcing some how and can this be ignored?

 

[zEitEr]

If the files do not exist, then I believe there is nothing to worry about. The files are used only for DKIM-singing outgoing emails send in behalf of your server (root@server.domain.com or admin@server.domain.com). They might be related to brute-forcing, if your server constantly send notifications about brute-force to you.