I've got a weird split setup where POP3 is currently handled by Courier (courier-imap-3.0.2 distribution), and IMAP is currently handled by the RHEL 5 version of Dovecot (1.0.7)
I'm trying to figure out a way to convert the POP3 UIDLs (in cases where the courierpop3dsizelist is newer than dovecot-uidlist, at least) to something that Dovecot will read, or to configure Dovecot's pop3 to use a UIDL format that will work, as mentioned in the migration wiki. We have some "squeaky wheel" users who don't have their POP clients set to delete messages, and are likely to complain about re-downloading their several GB of mail.
Thus far, the migration scripts haven't seemed to work properly, maybe because of the versions I'm using. I'm not sure whether the Courier versions there refer to Courier MTA version or Courier IMAP version, but adjusting the UIDL format to %v-%u (as suggested for early Courier 3 / Dovecot 1.0) hasn't worked (I saw %u-%v online, but that also didn't work). Since the Courier system doesn't seem to report validity, I also tried just '%u' - this works *if* I delete the header line as well as rename the courierpop3dsizelist to dovecot-uidlist, but I still don't get the exact same UIDLs as before.
I'm willing to write my own migration tool, or to adapt the existing one, but I could use some assistance knowing how to do the translation.
Dovecot -n for that instance is below, slightly sanitized, obviously I can change pop3_uidl_format; I also tried getting rid of pop3_reuse_xuidl:
Basically, to give a concreate example, the Courier system seems to use the filename as the UIDL, with this courierpop3dsizelist: /2 45 1382654636 1199751891.13891_0.water-ox:2,Sa 2412 0:1382654636 1199927364.22870_0.fire-ox:2,S 2440 0:1382654636 1199936486.3332_0.wood-ox:2,Sa 2074 0:1382654636 1199985712.27745_0.water-ox:2,RS 4007 0:1382654636 1199993867.23139_0.fire-ox:2,S 1550 0:1382654636
producing this UIDL output: UIDL +OK 1 1199751891.13891_0.water-ox 2 1199927364.22870_0.fire-ox 3 1199936486.3332_0.wood-ox 4 1199985712.27745_0.water-ox 5 1199993867.23139_0.fire-ox [...]
Dovecot's dovecot-uidlist: 3 V1199747645 N606 562 W2412 :1199751891.13891_0.water-ox:2,Sa 563 W2440 :1199927364.22870_0.fire-ox:2,S 564 W2074 :1199936486.3332_0.wood-ox:2,Sa 565 W4007 :1199985712.27745_0.water-ox:2,RS 566 W1550 :1199993867.23139_0.fire-ox:2,S
producing: UIDL +OK 1 1199747645-562 2 1199747645-563 3 1199747645-564 4 1199747645-565 5 1199747645-566
(or, if I change the format to just %u): +OK 1 650 2 651 3 652 4 653 5 654
# dovecot --version 1.0.7
# 1.0.7: /etc/dovecot.d/XXX.cfg base_dir: /var/run/dovecot/pop-its syslog_facility: local4 protocols: pop3 pop3s listen: *:110 ssl_listen: *:995 ssl_ca_file: /etc/pki/dovecot/certs/XX.pem ssl_cert_file: /etc/pki/dovecot/certs/XXXX.pem ssl_key_file: /etc/pki/dovecot/private/XXXX.key disable_plaintext_auth: yes login_dir: /var/run/dovecot/pop-its/login login_executable: /usr/libexec/dovecot/pop3-login login_greeting_capability: yes login_processes_count: 4 login_max_processes_count: 512 verbose_proctitle: yes mail_location: maildir:/var/spool/maildir/%1Ln/%Ln:INDEX=/var/spool/dovecot/indexes/%1Ln/%Ln mail_debug: yes mmap_disable: yes maildir_copy_with_hardlinks: yes mail_executable: /usr/libexec/dovecot/pop3 mail_plugin_dir: /usr/lib/dovecot/pop3 pop3_reuse_xuidl: yes pop3_uidl_format: %v-%u pop3_client_workarounds: outlook-no-nuls oe-ns-eoh namespace: type: private separator: . prefix: Mail. inbox: yes auth default: mechanisms: plain login passdb: driver: ldap args: /etc/dovecot.conf-ldap userdb: driver: static args: uid=vmail gid=mail home=/var/spool/maildir/%1Ln/%Ln socket: type: listen master: path: /var/run/dovecot/pop-its/auth-master mode: 384 user: vmail group: mail
TIA!
/wby