--- /dev/null
+#!perl -w
+# Copyright (C) 2021 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use v5.10.1;
+use PublicInbox::TestCommon;
+use POSIX qw(WTERMSIG WIFSIGNALED SIGPIPE);
+test_lei(sub {
+ my $f = "$ENV{HOME}/big.eml";
+ my $imported;
+ for my $out ([], [qw(-f mboxcl2)]) {
+ pipe(my ($r, $w)) or BAIL_OUT $!;
+ my $size = 65536;
+ if ($^O eq 'linux' && fcntl($w, 1031, 4096)) {
+ $size = 4096;
+ }
+ unless (-f $f) {
+ open my $fh, '>', $f or xbail "open $f: $!";
+ print $fh <<'EOM' or xbail;
+From: big@example.com
+Message-ID: <big@example.com>
+EOM
+ print $fh 'Subject:';
+ print $fh (' '.('x' x 72)."\n") x (($size / 73) + 1);
+ print $fh "\nbody\n";
+ close $fh or xbail "close: $!";
+ }
+
+ lei_ok(qw(import), $f) if $imported++ == 0;
+ open my $errfh, '>>', "$ENV{HOME}/stderr.log" or xbail $!;
+ my $opt = { run_mode => 0, 2 => $errfh, 1 => $w };
+ my $cmd = [qw(lei q -q -t), @$out, 'z:1..'];
+ my $tp = start_script($cmd, undef, $opt);
+ close $w;
+ is(sysread($r, my $buf, 1), 1, 'read one byte');
+ close $r; # trigger SIGPIPE
+ $tp->join;
+ ok(WIFSIGNALED($?), "signaled @$out");
+ is(WTERMSIG($?), SIGPIPE, "got SIGPIPE @$out");
+ }
+});
+
+done_testing;