Firstly, not everything in mail.err flagged as an error is an error, we send a few log entries to that log each day for critical daily events so you can kind of see that things are running normally and if the server does die you can see if it was just after it started some significant nightly process.
If you are using letsencrypt then once a day it has to copy the ssl certificates from the letsencrypt folders to the surgemail/ssl files and reload them. this log entry may appear even if you aren't using letsencrypt.
ChrisP.
26 00:25:34.00:Err:3063003968: daily: letsecrypt copy and reload ssl certificates Virus-free. www.avast.com
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