sub Parse
{
    $first_header_part = 1;

    my ($msgbufp, $msgbufp1);
    for ($msgbufp = 0; $msgbufp <= $pmax; ) {
	$msgbufp1 = index($MessageBuffer, "\n", $msgbufp);
	last if $msgbufp1 < 0;
	$_        = substr($MessageBuffer, $msgbufp, $msgbufp1 - $msgbufp);
	$msgbufp  = $msgbufp1 + 1;

	if ($MTA eq 'exim' || $MTA eq 'qmail') {
	    /^\s*(\S+\@\S+):\s*$/ && ($CurAddr = $1);
	    $CurAddr =~ s/[\<\>]//g;
	    $CurAddr =~ s/\s*//g;
	    &Debug("CurAddr => $CurAddr") if $debug && $CurAddr;
	}

	### unknown MTA  ###
	if (/(\S+\@[-A-Z0-9\.]+)/i) {
	    /(\S+\@[-A-Z0-9\.]+)/i && ($P_CurAddr = $1); # pseudo
	    $P_CurAddr =~ s/[\<\>]//g;
	    $P_CurAddr =~ s/\s*//g;
	    &Debug("P_CurAddr => $P_CurAddr") if $debug && $P_CurAddr;
	}

	##### TRAP CODE #####
	if (/fatal error/i) { $fatal++;}

	if (/\@/ && /(5\d\d)/)    { &AnalyzeErrorCode($_); $found++; }
	if (/\@/ && /$TrapWord/i) { &AnalyzeErrorWord($_); $found++; }

	### unknown MTA
	# e.g. uset not known
	if (/$TrapWord/i && $P_CurAddr) {
	    &AnalyzeErrorWord($_, $P_CurAddr);
	    $found++;
	}

	# EXIM pattern
	if (/failed/i && $MTA eq 'exim') {
	    $trap_want_addr = $_;
	    next;
	}
	if ($trap_want_addr && /\@/ && $MTA eq 'exim') {
	    local($a);
	    /^\s*(\S+\@\S+)/ && ($a = $1);
	    $a =~ s/[\<\>:]//g;
	    &CacheOn($a, " ") if $a; # space is a dummy
	    undef $trap_want_addr;
	}

	if (/($ErrorCodePat)/ && $MTA eq 'exim') {
	    &AnalyzeErrorWord($_, $CurAddr);
	    $found++;
	}

	### sendmail
	if ($fatal) {
	    local($a);
	    /^\s*(\S+\@\S+)/ && ($a = $1);
	    $a =~ s/[\<\>]//g;
	    &CacheOn($a, " ") if $a; # space is a dummy
	}
	# end of fatal block
	if ($fatal && /^$/) {
	    undef $fatal;
	}
    }

    # VERPs: qmail specific
    # Suppose list-admin-account=domain@$mydomain syntax, ...
    {
	local($ra, $addr);

	$addr = $ENV{'RECIPIENT'};
	$ra   = $ENV{'RECIPIENT'};

	if ($addr =~ /=/) {
	    $addr =~ s/\@\S+$//;
	    $addr =~ s/=/\@/;
	    $addr =~ s/^\S+\-admin\-//; # fml specific

	    $ra =~ s/admin\-\S+\@/admin@/;

	    &Debug("qmail:". $addr);
	    &Debug("qmail return_addr:". $ra);
	    $return_addr{$ra} = 1;
	    &CacheOn($addr, " ");
	}
    }
}