[Dovecot] Delivery failure about update to 1.2.4 (Debian)

[William Witteman]

Version:
1.2.4

Config:
# 1.2.4: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.26-2-686 i686 Debian squeeze/sid ext3
log_path: /var/log/dovecot.log
info_log_path: /var/log/dovecot-info.log
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imap imaps pop3 pop3s
ssl_ca_file: /etc/ssl/certs/gd_intermediate_bundle2.crt
ssl_cert_file: /etc/ssl/certs/theta.crt
ssl_key_file: /etc/ssl/private/theta.key
ssl_key_password: obfuscated
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
mail_location: maildir:/home/vmail/%d/%n
mbox_write_locks: fcntl dotlock
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
lda:
  log_path: /home/vmail/dovecot-deliver.log
  auth_socket_path: /var/run/dovecot/auth-master
  postmaster_address: obfuscated
  mail_plugins: cmusieve
  global_script_path: /home/vmail/globalsieverc
auth default:
  mechanisms: plain login digest-md5
  user: vmail
  debug: yes
  passdb:
    driver: passwd-file
    args: /etc/dovecot/passwd
  userdb:
    driver: static
    args: uid=5000 gid=5000 home=/home/vmail/%d/%n
  socket:
    type: listen
    client:
      path: /var/run/dovecot/auth-client
      mode: 438
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: vmail


I recently updated Debian (testing).  Now, no mail is getting from
postfix to dovecot, but postfix didn't get upgraded.  dovecot seems
happy (after I fixed the "ssl = yes" change (speaking of which, that
line is not in the dovecot -n output)), but postfix is unable to deliver
email to it.  Here is a sample mail.log entry:

Oct  5 14:47:07 theta postfix/pipe[30972]: 451873B5B8: to=<obfuscated>, relay=dovecot, delay=168521, delays=168521/0.01/0/0.02, dsn=4.3.0, status=deferred (temporary failure)

I cannot seem to figure out what changed and why things are now broken.
Can anyone help?  Thanks.
-- 

yours,

William