Name: uidl_format
Type: ENUM
Allowed-Values: uidonly cyrus dovecot courier
Default-Value: cyrus
Last-Modified: 3.0.0

Choose the format for UIDLs in pop3.  Possible values are "uidonly",
"cyrus", "dovecot" and "courier".  "uidonly" forces the old default of UID,
"cyrus" is UIDVALIDITY.UID.  Dovecot is 8 digits of leading hex (lower
case) each UID UIDVALIDITY. Courier is UIDVALIDITY-UID.
