Script gets delivery errors from mbox file.

get_delivery_errors.py

#!/usr/bin/env python

import sys

def writeErrors(mbox,filename):
    isMessage=lambda c: mbox[c].strip()=='The mail system'
    getMessage = lambda c,s: s if mbox[c].strip()=='' else s+' '+getMessage(c+1,mbox[c].strip())
    counter=0
    f=open(filename,'w')
    while counter<len(mbox):
    	if isMessage(counter):
	    counter+=2
	    f.write((getMessage(counter,'')).strip())
	    f.write('\n')
	counter+=1
    f.close()

if len(sys.argv)!=3:
	print('usage: get_delivery_errors mbox_file error_file')
	exit(1)


f=file(sys.argv[1],'r')
mbox=f.readlines()
f.close()
writeErrors(mbox,sys.argv[2])