Mail to amavis@myhostname bounced (user unknown) (Zentyal 5.07)

[kvm]

Hi all.

I see subject message regularly in mail logs.  Sender is the same - amavis@myhostname
How can I fix it, allow postfix to relay messages to local domain or add this address to aliaces, at last?
This happened after upgrade from 4.1.12 Zentyal to 5.0 version.

[Neustradamus]

Same problem with last Zentyal (updated)

[kvm]

UPDATE:  For investigation, I did alias of this unknown address to my work mail, get this messages, and that is what I see:

1. Sender: Cron daemon
2. Subject of message: "Cron <amavis@mail> test -e /usr/sbin/amavisd-new-cronjob && /usr/sbin/amavisd-new-cronjob sa-sync"
3. Text content of message: "Wide character in print at /usr/share/perl5/Razor2/Logger.pm line 107."