1 # Copyright (C) 2013-2015 all contributors <meta@public-inbox.org>
2 # License: AGPLv3 or later (https://www.gnu.org/licenses/agpl-3.0.txt)
4 # For the -mda script (mail delivery agent)
5 package PublicInbox::MDA;
10 use Date::Parse qw(strptime);
11 use constant MAX_SIZE => 1024 * 500; # same as spamc default, should be tunable
12 use constant MAX_MID_SIZE => 244; # max term size - 1 in Xapian
14 # drop plus addressing for matching
17 $str_addr =~ s/\+.*\@/\@/;
21 # do not allow Bcc, only Cc and To if recipient is set
23 my ($klass, $filter, $address) = @_;
24 my Email::Simple $simple = $filter->simple;
25 my @mid = $simple->header('Message-ID');
26 return 0 if scalar(@mid) != 1;
28 return 0 if (length($mid) > MAX_MID_SIZE);
29 return 0 unless usable_str(length('<m@h>'), $mid) && $mid =~ /\@/;
30 return 0 unless usable_str(length('u@h'), $filter->from);
31 return 0 unless usable_str(length(':o'), $simple->header("Subject"));
32 return 0 unless usable_date($simple->header("Date"));
33 return 0 if length($simple->as_string) > MAX_SIZE;
34 alias_specified($filter, $address);
39 defined($str) && length($str) >= $len;
43 my @t = eval { strptime(@_) };
48 my ($filter, $address) = @_;
50 my @address = ref($address) eq 'ARRAY' ? @$address : ($address);
52 my @recip = Email::Address->parse($_);
53 lc(__drop_plus($recip[0]->address)) => 1;
56 foreach my $line ($filter->cc, $filter->to) {
57 foreach my $addr (Email::Address->parse($line)) {
58 if ($ok{lc(__drop_plus($addr->address))}) {
66 sub set_list_headers {
67 my ($class, $simple, $dst) = @_;
68 unless (defined $simple->header('List-Id')) {
69 my $pa = $dst->{-primary_address};
70 $simple->header_set("List-Id", "<$pa>"); # RFC2919
73 foreach my $h (qw(delivered-to), # prevent training loops
74 # The rest are taken from Mailman 2.1.15
75 # could contain passwords:
76 qw(approved approve x-approved x-approve urgent),
77 # could be used phishing:
78 qw(return-receipt-to disposition-notification-to
79 x-confirm-reading-to),
82 $simple->header_set($h);