Xử lý lỗi file_dotlock_create(varmailusername) failed Permission denied trên mail exim

Xử lý lỗi​​ file_dotlock_create(varmailusername) failed Permission denied

Apr ​​ 3 00:10:11 autumn dovecot: imap(username): Error: file_dotlock_create(/var/mail/username) failed: Permission denied (euid=1000(username) egid=1000(username) missing +w perm: /var/mail, euid is not dir owner) (set mail_privileged_group=mail)

sudo nano /etc/dovecot/conf.d/10-mail.conf

change the parameter #mail_privileged_group to mail_privileged_group = mail

#save file

sudo service dovecot restart

Done.