Cron output email fails: Undelivered Mail Returned to Sender

What type of hardware are you using: VPS bought online
What YunoHost version are you running: 11.3.0.2
How are you able to access your server: SSH

Describe your issue

Every time a CRON job runs on the server, I receive an email informing me that the email delivery to admin@mydomain.com has failed.

Share relevant logs or error messages

From: MAILER-DAEMON@nyuno.kuba-orlik.name (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender
To: root@mydomain.com


This is the mail system at host mydomain.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<admin@mydomain.com> (expanded from <root>): user unknown. Command
    output: lda(admin@mydomain.com): Error:
    net_connect_unix(/run/dovecot/stats-writer) failed: Permission denied

You may not have a user admin… User ‘Admin_legacy’ created on latest update - #12 by deljones

When I try to create an admin user, the form claims it already exists:

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