Hi, It seems as if the file was not accessible during the error:
2024-11-29T08:47:53.175973+01:00 mailserver dovecot: imap(user)<384417><pFF2aggou/1dIlwX>: Error: Mailbox INBOX: open(/mnt/mail-storage-lv0007/user/Maildir/cur/1732821799.M49852P251433.mailserver,S=69279,W=71660:2,) failed: Permission denied (euid=501(vmail) egid=501(vmail) missing +r perm: /mnt/mail-storage-lv0007/user/Maildir/cur/1732821799.M49852P251433.mailserver,S=69279,W=71660:2, stat(/mnt/mail-storage-lv0007/user/Maildir/cur/1732821799.M49852P251433.mailserver,S=69279,W=71660:2,) failed: Permission denied)
$ sudo namei -vl 1732821799.M49852P251433.mailserver,S=69279,W=71660:2 f: 1732821799.M49852P251433.mailserver,S=69279,W=71660:2 1732821799.M49852P251433.mailserver,S=69279,W=71660:2 - No such file or directory