; MSGID's..   1:203/2 AAAABBCC
;             aaaa=crc%65536 of user@
;             bbbb=crc%65536 of @domain
; 12312312 
; semicolans comment
; 
AAAABBBBB <msgid@somewhere> <reference@somewhere> <reference@somewhere>
alt.foobar,alt.spam,alt.hormel

+ 
binary index
4bytes=MSGID used
4bytes=offset to text file

