Two cron.daily jobs want to send status notifications from the root
account to root.
The problem is, that courier rejects these E-Mails with "550 User Unknown".
The Log entry says from ro...@example.com to ro...@example.com
The status notification to ro...@example.com also fails and the EMail
ends up as an attachment of an attached status notification to status
notification in the postmaster-account.
The file /etc/courier/defaultdomain exists and contains "example.com".
The alias-database contains an entry
The postmaster-account as virtual account in userdb.
I've tried to reproduce this issue with sendmail and mail, but I wasn't
"successful", it worked correctly.