I got the Message:
You have new mail in /var/mail/root
Can I delete this file without any problems?
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Not necessarily a good idea.
/var/mail/root contains email messages that some process on your system tried to bring to the attention of
root, the system administrator. Read the messages.
If you delete
/var/mail/root, you will lose all these messages, and
/var/mail/root will be created anew the next time there's a message.