dovecot.conf сюда не влезет

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Я так понимаю если пользователи у меня локальные так как Машина в Домене ,то и авторизация должна быть PAM ?

или LDAP

тогда как вам помочь? я надеюсь вы понимаете что для диагностики проблемы просто строчки из лога

не достачтоно.
Косяк почти наверняка в конфиге. Банальное misconfigured либо опечатка.

protocols = imap imaps
listen = *
log_path = /var/log/dovecot/dovecot.log
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_location = maildir:/var/mail/%u
   # Hierarchy separator to use. You should use the same separator for all
   # namespaces or some clients get confused. '/' is usually a good one.
   # The default however depends on the underlying mail storage format.
   #separator =
   # Prefix required to access this namespace. This needs to be different for
   # all namespaces. For example "Public/".
   #prefix =
   # Physical location of the mailbox. This is in same format as
   # mail_location, which is also the default for it.
   #location =
   # There can be only one INBOX, and this setting defines which namespace
   # has it.
   #inbox = no
   # If namespace is hidden, it's not advertised to clients via NAMESPACE
   # extension. You'll most likely also want to set list=no. This is mostly
   # useful when converting from another server with different namespaces which
   # you want to deprecate but still keep working. For example you can create
   # hidden namespaces with prefixes "~/mail/", "~%u/mail/" and "mail/".
   #hidden = yes
   # Show the mailboxes under this namespace with LIST command. This makes the
   # namespace visible for clients that don't support NAMESPACE extension.
   # "children" value lists child mailboxes, but hides the namespace prefix.
   #list = yes
   # Namespace handles its own subscriptions. If set to "no", the parent
   # namespace handles them (empty prefix should always have this as "yes")
   #subscriptions = yes
   #separator = /
   # Mailboxes are visible under "shared/user@domain/"
   # %%n, %%d and %%u are expanded to the destination user.
   #prefix = shared/%%u/
   # Mail location for other users' mailboxes. Note that %variables and ~/
   # expands to the logged in user's data. %%n, %%d, %%u and %%h expand to the
   # destination user's data.
   #location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
   # Use the default namespace for saving subscriptions.
   #subscriptions = no
   # List the shared/ namespace only if there are visible shared mailboxes.
   #list = children
mail_privileged_group = mail
mail_debug = yes
protocol imap {
  # Login executable location.
  #login_executable = /usr/lib/dovecot/imap-login
  # IMAP executable location. Changing this allows you to execute other
  # binaries before the imap process is executed.
  #
  # This would write rawlogs into user's ~/dovecot.rawlog/, if it exists:
  #   mail_executable = /usr/lib/dovecot/rawlog /usr/lib/dovecot/imap
  # </usr/doc/dovecot-common/wiki/Debugging.Rawlog.txt>
  #
  # This would attach gdb into the imap process and write backtraces into
  # /tmp/gdbhelper.* files:

Oscor нет у меня такого пакета ....(

auth_debug = yes и он все в логи кидает , это булевый параметр (вовсяком случае у меня)

ваша правла, затупил
давайте тогда вывод doveconf -nm auth, doveconf -nm imap, doveconf -nm imap-login
ps: кстати на вики рекомендуют еще auth_debug_passwords=yes

mail_privileged_group = mail
auth_debug = yes
mail_debug = yes
protocol imap {
}

log:
2012-09-19 11:30:16 dovecot: Warning: Killed with signal 15 (by pid=8241 uid=0 code=kill)
2012-09-19 11:30:16 dovecot: Info: Dovecot v1.2.15 starting up (core dumps disabled)
2012-09-19 11:30:17 auth(default): Info: new auth connection: pid=8256
2012-09-19 11:30:17 auth(default): Info: new auth connection: pid=8255
2012-09-19 11:30:17 auth(default): Info: new auth connection: pid=8254
У меня в конфиге достаточно указать  auth_debug = yes и он все в логи кидает , это булевый параметр (вовсяком случае у меня)

auth_debug = <путь_к_логу>, mail_debug=yes

и

вы игнорируете или просто упускаете эту часть конфига в посте?