Record Format
-------------

Syntax notes:
- ( P )* means "zero or more of the P"
- ( P )+ means "one or more of the P"
- { P } means "zero or one of the P"
  (ie P is optional and may be omitted)

New version 2 records have the following format:
	0x02
	( flag-number flag-value )* NUL
	password-crypt NUL
	{ mailbox } NUL
	( alias NUL )* NUL
	personal-information NUL
	hard-quota NUL
	soft-quota NUL
	message-size-limit NUL
	message-count-limit NUL
	creation-time NUL
	expiry-time NUL

flag-number and flag-value are single-byte values.  The flag numbers are
the same as the attribute number defined in vdomain/vdomain.h.

The maximum values for limits (quota, etc.) are expressed in the file as
"-" and internally as UINT_MAX.  Records with an unknown creation time
have the creation-time set to the UNIX epoch (midnight GMT January 1,
1970).

Old Record Formats
------------------

Version 1 records have the following format:
	0x01
	password-crypt NUL
	{ mailbox } NUL
	( alias NUL )* NUL
	personal-information NUL
	hard-quota NUL
	soft-quota NUL
	message-size-limit NUL
	message-count-limit NUL
	creation-time NUL
	expiry-time NUL

Old style records had the following format:
	":" password-crypt ":" destination
The destination was prefixed with '&' for a forward, and with either '.'
or '/' for a mailbox.

Proposed Record Format
----------------------

New version 3 records have the following format:
	0x03
	( flag-number flag-value )* NUL
	password-crypt NUL
	{ mailbox } NUL
	( alias NUL )* NUL
	personal-information NUL
	hard-quota NUL
	soft-quota NUL
	message-size-limit NUL
	message-count-limit NUL
	creation-time NUL
	expiry-time NUL
	last-modified-time NUL

flag-number and flag-value are single-byte values.  The flag numbers are
the same as the attribute number defined in vdomain/vdomain.h.  The flag
value is either ASCII '0' for false/off or ASCII '1' for true/on.