-Dovecot.log : Mar 29 11:00:06 Error: POP3(user_login): Couldn't init INBOX: Mailbox isn't a valid mbox -The mailbox start with either 'FFrom or 'FrFrom'I haven't seen these since v0.99. Are you using also Dovecot deliver? Is anything else than Dovecot modifying the mbox files? I don't really have any great ideas, other than some locking problem if something besides Dovecot does changes..
We're having the same issues on our servers here and it oddly started at exactly the same time (March 20th or so) with no changes made by us.
We've upgraded to the latest Dovecot 1.2.11 and are using Dovecot 'deliver' exclusively. Tried setting fsync_disable=no, but the problem persists. It seems to only occur for mailboxes that are being accessed via POP3 and leaving mail on the server.
Any further insights? I'm surprised more people aren't experiencing this problem. I don't think we're doing anything particularly special.
Thanks, Erik
# 1.2.11: /etc/postfix/dovecot.conf # OS: FreeBSD 7.2-STABLE i386 base_dir: /var/run/dovecot protocols: imap imaps pop3 pop3s ssl_cert_file: sslcert.pem ssl_key_file: sslcert.pem ssl_cipher_list: ALL:!aNULL:!ADH:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM:!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 mbox_read_locks: flock mbox_write_locks: flock 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_plugins(default): quota imap_quota mail_plugins(imap): quota imap_quota mail_plugins(pop3): quota 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): outlook-idle tb-extra-mailbox-sep imap_client_workarounds(imap): outlook-idle tb-extra-mailbox-sep imap_client_workarounds(pop3): pop3_no_flag_updates: yes pop3_client_workarounds(default): pop3_client_workarounds(imap): pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh lda: auth_socket_path: /var/run/dovecot/auth-master postmaster_address: postmaster mail_plugins: quota sendmail_path: /usr/sbin/sendmail auth default: mechanisms: plain login master_user_separator: * passdb: driver: passwd-file args: virtual.passwd passdb: driver: passwd-file args: username_format=%n@%l virtual.ip.passwd passdb: driver: passwd-file args: master.passwd passdb: driver: passwd-file args: master.user pass: yes master: yes userdb: driver: passwd-file args: virtual.passwd userdb: driver: passwd-file args: master.passwd socket: type: listen master: path: /var/run/dovecot/auth-master mode: 432 user: vmail group: users