Subj : Name that compression... To : mark lewis From : Maurice Kinal Date : Sat Mar 30 2019 01:22:44 Hey mark! ml> i didn't write GoldED and i haven't dug into the C code to try ml> to find out... Just looking at it I get the impression that it is the 32 bit hex value for unixtime. Take a look at the following for confirmation; TZ=EST5EDT date --date=@$(printf "%d" 0x5c9ec143) +"%d %b %y %T" = 29 Mar 19 21:07:15 which is very close to the obsoleted msgHeader's datetime stamp in your reply = 29 Mar 19 21:04:38. Coincidence? I think not. I am guessing golded adds the MSGID just before you save it given there is just under 3 minutes difference. In the routine I use it creates the MSGID from the same unixtime as the obsoleted msgHeader's datetime stamp and thus are identical. Life is good, Maurice .... Don't cry for me I have vi. --- GNU bash, version 5.0.3(1)-release (x86_64-pc-linux-gnu) * Origin: Little Mikey's EuroPoint - Ladysmith BC, Canada (2:280/464.113) .