Can't see a specific mail in thunderbird but with mobile mail client

[J. Echter]

Hi,

i've seen a strange behaviour in our system (centos 7, dovecot 2.2.36
(1f10bfa63) today.

We got a mail and it got delivered.

Dec  3 07:56:25 mail postfix/lmtp[4013]: 915B0CEF4C2: to=<user at domain>,
relay=mail[private/dovecot-lmtp], delay=1.5, delays=1.3/0.03/0.02/0.19,
dsn=2.0.0, status=sent (250 2.0.0 <user at domain> AOhCNBgH5l2vDwAAtnFApQ:2
Saved)
Dec  3 07:56:25 mail dovecot: lmtp(user at domain):
AOhCNBgH5l2vDwAAtnFApQ:2: sieve:
msgid=<289913405.81.1575356173625.JavaMail.SYSTEM at EUWS0716>: stored mail
into mailbox 'INBOX'

I also see this mail on the filesystem in the users cur dir:

-rw-r--r--.  1 vmail vmail  448818  3. Dez 07:56
1575356184.M937345P4015.mail,S=611100,W=619338:2,Sae

But i don't see this single mail in thunderbird and not in sogo
(http://www.sogo.nu), but i can see it in the mobile mail client.

Does anyone have a suggfestion what may be wrong here?

I paste my dovecot -n output here:

# 2.2.36 (1f10bfa63): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.24 (124e06aa)
# OS: Linux 3.10.0-1062.4.3.el7.x86_64 x86_64 CentOS Linux release
7.7.1908 (Core) xfs
# Hostname: mail.workgroup.local
auth_master_user_separator = *
auth_verbose = yes
base_dir = /var/run/dovecot/
default_vsz_limit = 2 G
imap_id_log = *
imap_id_send = *
log_timestamp = "%Y-%m-%d %H:%M:%S "
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k
mail_gid = 5000
mail_home = /DATEN/vmail/%Ld/%Ln
mail_location = maildir:/DATEN/vmail/%Ld/%Ln/mail/
mail_plugins = " zlib fts fts_solr mail_log notify"
mail_uid = 5000
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 ihave
namespace inbox {
  inbox = yes
  location =
  mailbox Archive {
    auto = no
    special_use = \Archive
  }
  mailbox Archives {
    auto = subscribe
    special_use = \Archive
  }
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Spam {
    auto = no
    special_use = \Junk
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  prefix =
}
passdb {
  args = /etc/dovecot/passwd.masterusers
  driver = passwd-file
  master = yes
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
plugin {
  fts = solr
  fts_autoindex = yes
  fts_solr = break-imap-search url=http://localhost:8983/solr/dovecot/
  imapsieve_mailbox1_before = file:/etc/dovecot/sieve/learn-spam.sieve
  imapsieve_mailbox1_causes = COPY
  imapsieve_mailbox1_name = Junk
  imapsieve_mailbox2_before = file:/etc/dovecot/sieve/learn-ham.sieve
  imapsieve_mailbox2_causes = COPY
  imapsieve_mailbox2_from = Junk
  imapsieve_mailbox2_name = *
  mail_log_events = delete undelete expunge copy mailbox_delete
mailbox_rename
  mail_log_fields = uid box msgid size
  mailbox_alias_new = Sent Messages
  mailbox_alias_new2 = Sent Items
  mailbox_alias_new3 = Deleted Messages
  mailbox_alias_new4 = Papierkorb
  mailbox_alias_new5 = Spam
  mailbox_alias_old = Sent
  mailbox_alias_old2 = Sent
  mailbox_alias_old3 = Trash
  mailbox_alias_old4 = Trash
  mailbox_alias_old5 = Junk
  mailbox_list_index = yes
  recipient_delimiter = +
  sieve = /DATEN/vmail/%Ld/%Ln/.dovecot.sieve
  sieve_after = /etc/dovecot/sieve-after
  sieve_global_extensions = +vnd.dovecot.pipe
  sieve_pipe_bin_dir = /usr/bin
  sieve_plugins = sieve_imapsieve sieve_extprograms
  zlib_save = gz
  zlib_save_level = 6
}
protocols = sieve imap lmtp
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0660
    user = vmail
  }
  user = root
}
service imap-login {
  chroot = login
  executable = /usr/libexec/dovecot/imap-login
  inet_listener imap {
    port = 0
  }
  process_min_avail = 4
  user = dovecot
}
service imap {
  executable = /usr/libexec/dovecot/imap
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
}
service managesieve-login {
  chroot = login
  user = dovecot
}
service pop3-login {
  chroot = login
  user = dovecot
}
ssl = required
ssl_cert = </etc/pki/tls/certs/server.crt
ssl_key =  # hidden, use -P to show it
userdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
valid_chroot_dirs = /var/spool/vmail
protocol lda {
  mail_plugins = sieve
  postmaster_address = postmaster
}
protocol imap {
  mail_plugins = " zlib fts fts_solr mail_log notify imap_zlib imap_sieve"
}
protocol lmtp {
  mail_plugins = " zlib fts fts_solr mail_log notify quota sieve"
  postmaster_address = postmaster at domain
}

Thanks for any hints.

Greetings

Juergen