Hi Guys,
Since few weeks, our email server based on Dovecot and Postfix has been
returning this error with some users without any changes made to the
configuration:
mailserver dovecot: imap(user)<1115049><sEfO8d8nm/1dIlwX>: Error: Mailbox
INBOX:
open(/mnt/mail-storage/user/Maildir/cur/1732656368.M835097P860226.mailserver,S=43548,W=44150:2,)
failed: Permission denied (euid=501(vmail) egid=501(vmail) missing +r perm:
/mnt/mail-storage/user/Maildir/cur/1732656368.M835097P860226.mailserver,S=43548,W=44150:2,
stat(/mnt/mail-storage/user/Maildir/cur/1732656368.M835097P860226.mailserver,S=43548,W=44150:2,)
failed: Permission denied)
mailserver dovecot: imap(user)<1115049><sEfO8d8nm/1dIlwX>: Disconnected: FETCH
failed: Mailbox INBOX:
open(/mnt/mail-storage/user/Maildir/cur/1732656368.M835097P860226.mailserver,S=43548,W=44150:2,)
failed: Permission denied (euid=501(vmail) egid=501(vmail) missing +r perm:
/mnt/mail-storage/user/Maildir/cur/1732656368.M835097P860226.mailserver,S=43548,W=44150:2,
stat(/mnt/mail-storage/user/Maildir/cur/1732656368.M835097P860226.mailserver,S=43548,W=44150:2,)
failed: Permission denied) in=429 out=24093 deleted=0 expunged=0 trashed=0
hdr_count=2 hdr_bytes=6437 body_count=0 body_bytes=0
This is the stat of the file after reboot the server:
stat 1732656368.M835097P860226.ganimede,S=43548,W=44150:2,
File: 1732656368.M835097P860226.ganimede,S=43548,W=44150:2,
Size: 43548 Blocks: 88 IO Block: 262144 regular file
Device: 0,41 Inode: 2155401218 Links: 1
Access: (0600/-rw-------) Uid: ( 501/ vmail) Gid: ( 501/ vmail)
Access: 2024-11-26 22:26:09.925862755 +0100
Modify: 2024-11-26 22:26:10.005861434 +0100
Change: 2024-11-26 22:26:11.175842122 +0100
Birth: -
The strange thing is that the issue seems to this impact only some Users and
looks like the error disappear after restarting the server, and reappear few
time later.
Dovecot -n:
# 2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.19 (4eae2f79)
# OS: Linux 6.1.0-26-amd64 x86_64 Debian 12.7
auth_mechanisms = plain login
default_vsz_limit = 1 G
doveadm_password = # hidden, use -P to show it
doveadm_port = 12345
mail_gid = 501
mail_location = maildir:~/Maildir:INDEX=/var/indexes/%n
mail_max_userip_connections = 50
mail_plugins = " notify replication zlib"
mail_privileged_group = vmail
mail_uid = 501
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character
vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy
include variables body enotify environment mailbox date index ihave duplicate
mime foreverypart extracttext vacation-seconds imapflags notify
namespace inbox {
inbox = yes
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox "Posta inviata" {
special_use = \Sent
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix =
}
passdb {
args = /etc/dovecot/dovecot-ldap.conf
driver = ldap
}
plugin {
mail_replica = tcp:192.168.3.250
sieve = file:/var/www/html/ooo/%n;active=/var/www/html/ooo/%n/script
sieve_default = /var/www/html/ooo/default.sieve
sieve_duplicate_default_period = 14d
sieve_duplicate_max_period = 7d
sieve_extensions = +duplicate +notify +imapflags +vacation-seconds
sieve_user_log = /var/www/html/ooo/%n/sieve_error.log
}
protocols = " imap lmtp sieve pop3"
replication_max_conns = 2
service aggregator {
fifo_listener replication-notify-fifo {
user = vmail
}
unix_listener replication-notify {
user = vmail
}
}
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0660
user = postfix
}
unix_listener auth-master {
group = vmail
mode = 0660
user = vmail
}
}
service doveadm {
inet_listener {
port = 12345
}
}
service imap-login {
process_limit = 200
}
service imap {
vsz_limit = 1 G
}
service lmtp {
process_min_avail = 5
unix_listener /var/spool/postfix/private/dovecot-lmtp {
group = postfix
mode = 0600
user = postfix
}
user = vmail
}
service managesieve-login {
inet_listener sieve {
port = 4190
}
process_min_avail = 10
service_count = 1
}
service replicator {
process_min_avail = 1
unix_listener replicator-doveadm {
mode = 0666
user = vmail
}
}
service stats {
unix_listener stats-reader {
group = vmail
mode = 0666
user = vmail
}
unix_listener stats-writer {
group = vmail
mode = 0666
user = vmail
}
}
ssl_cert = </etc/dovecot/private/chain-star_trustitalia_it.pem
ssl_cipher_list =
ALL:!LOW:!aNULL:!eNULL:!SSLv2:!RC4:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
args = /etc/dovecot/dovecot-ldap.conf
driver = ldap
}
protocol lmtp {
mail_plugins = " notify replication zlib sieve quota zlib"
postmaster_address = postmas...@trustitalia.it
}
protocol lda {
auth_socket_path = /var/run/dovecot/auth-master
hostname = ganimede.trustitalia.it
mail_plugins = " notify replication zlib sieve quota zlib"
}
protocol imap {
mail_plugins = " notify replication zlib zlib"
}
protocol sieve {
mail_max_userip_connections = 10
managesieve_implementation_string = Dovecot Pigeonhole
managesieve_logout_format = bytes=%i/%o
managesieve_max_compile_errors = 5
managesieve_max_line_length = 64 k
}
protocol pop3 {
mail_plugins = " notify replication zlib zlib"
}
Thanks
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