mail -f /var/mail/debian9
/var/mail/debian9: 0 messages
When mail -f /var/mail/debian9
executing ,the claws mail application is in off status.
Now open the /var/mail/debian9 with claws mail.
sudo apt-get install -y claws-mail
claws mail is here claws mail
Claws-mail say there 665 total 655 unread.
Why mail -f /var/mail/debian9
display none of email?