dovecot: imap(melray): Error: open(/var/mail/melray) failed: Permission denied (euid=1000(melray) egid=1000(melray) missing +w perm: /var/mail, we're not in group 8(mail), dir owned by 0:8 mode=0775)

So do I need to add write permission for this user AND put the user in the mail group? I think that is correct but I'm not sure.