[Dovecot] pop3_lock_session question

Mark Costlow cheeks at swcp.com
Wed Feb 4 20:17:55 EET 2009

Hello, I'm preparing to convert from qpopper + UW-IMAP to dovecot.
So far testing has gone very well.  One problem we haven't figured
out is that long-running POP sessions keep the mailbox locked, so that
the MDA times out while trying to deliver.  We're using "maildrop" as
our MDA if that matters.

We don't see this issue for dovecot IMAP sessions.  During long-running
IMAP sessions, incoming messages are deilvered tot he user's INBOX
without delay.  But with POP, the MDA times out and the messages go
back to sendmail's queue for later delivery.

We though this setting would address the issue:

  # Keep the mailbox locked for the entire POP3 session.
  pop3_lock_session = no

But it doesn't seem to.

Any ideas?

Here is our "dovecot -n":

# 1.1.8: /usr/local/etc/dovecot.conf
# OS: FreeBSD 7.1-RELEASE-p2 i386  
base_dir: /var/run/dovecot/
protocols: imap imaps pop3 pop3s
ssl_cert_file: /etc/mail/certs/mail.swcp.com.pem
ssl_key_file: /etc/mail/certs/mail.swcp.com.pem
ssl_cipher_list: ALL:!LOW:!SSLv2
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/local/libexec/dovecot/imap-login
login_executable(imap): /usr/local/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/libexec/dovecot/pop3-login
login_greeting_capability(default): yes
login_greeting_capability(imap): yes
login_greeting_capability(pop3): no
verbose_proctitle: yes
first_valid_uid: 1000
first_valid_gid: 100
mail_privileged_group: mail
mail_location: mbox:~/:INBOX=/var/mail/%u:INDEX=/var/dovecot/%u
mail_full_filesystem_access: yes
mmap_disable: yes
mail_nfs_storage: yes
mail_nfs_index: yes
lock_method: dotlock
mbox_lock_timeout: 120
dbox_rotate_days: 0
mail_executable(default): /usr/local/libexec/dovecot/imap
mail_executable(imap): /usr/local/libexec/dovecot/imap
mail_executable(pop3): /usr/local/libexec/dovecot/pop3
mail_plugin_dir(default): /usr/local/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3
imap_client_workarounds(default): delay-newmail netscape-eoh tb-extra-mailbox-sep
imap_client_workarounds(imap): delay-newmail netscape-eoh tb-extra-mailbox-sep
pop3_reuse_xuidl(default): no
pop3_reuse_xuidl(imap): no
pop3_reuse_xuidl(pop3): yes
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
  mechanisms: plain login
  username_format: %Lu
  winbind_helper_path: /usr/local/bin/ntlm_auth
  verbose: yes
  debug: yes
  debug_passwords: yes
    driver: pam
    args: session=yes dovecot
    driver: passwd
    args: blocking=yes
    type: listen
      path: /var/run/dovecot/auth-client
      mode: 432
      path: /var/run/dovecot/auth-master
      mode: 384


Mark Costlow    | Southwest Cyberport | Fax:   +1-505-232-7975
cheeks at swcp.com | Web:   www.swcp.com | Voice: +1-505-232-7992

abq-strange.com -- Interesting photos taken in Albuquerque, NM
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