Parse mbox mail files with Procmail Formail

#Parsing mbox mail box files Procmail and Formail
sudo apt install procmail

#Split mbox file into files
cat inbox.mbox| formail -ds sh -c 'cat > msg.$FILENO'

#get subject
cat msg.000|formail -subject

#loop through each file
for i in msg*;do cat "$i"|formail -x subject -x To -x From;done