Documentation/public-inbox-learn.pod | 8 ++++++--
 script/public-inbox-learn            | 9 +++++++--

diff --git a/Documentation/public-inbox-learn.pod b/Documentation/public-inbox-learn.pod
index addcbcb5113f327b884f32a6116c25e1e4bd94b8..9c6b261b3a5b2a61be637345b9c3dc932b282a85 100644
--- a/Documentation/public-inbox-learn.pod
+++ b/Documentation/public-inbox-learn.pod
@@ -50,8 +50,12 @@ C<publicinboxmda.spamcheck> is C<none> in L<public-inbox-config(5)>.
 
 =item rm
 
-This is identical to the C<spam> command above, but does
-not feed the message to L<spamc(1)>
+This is similar to the C<spam> command above, but does
+not feed the message to L<spamc(1)> and only removes messages
+which match on any of the C<To:>, C<Cc:>, and C<List-ID:> headers.
+
+The C<--all> option may be used match C<spam> semantics in removing
+the message from all configured inboxes.
 
 =back
 
diff --git a/script/public-inbox-learn b/script/public-inbox-learn
index 0cb2c8e96e56e706b1e5f158003fa351cf9acc0d..5cd08d490bf0273bce85ce4d148bdb09035ad288 100644
--- a/script/public-inbox-learn
+++ b/script/public-inbox-learn
@@ -12,10 +12,15 @@ use PublicInbox::InboxWritable;
 use PublicInbox::Eml;
 use PublicInbox::Address;
 use PublicInbox::Spamcheck::Spamc;
+use Getopt::Long qw(:config gnu_getopt no_ignore_case auto_abbrev);
+my %opt = (all => 0);
+GetOptions(\%opt, 'all') or die "bad command-line args\n";
+
 my $train = shift or die "usage: $usage\n";
 if ($train !~ /\A(?:ham|spam|rm)\z/) {
 	die "`$train' not recognized.\nusage: $usage\n";
 }
+die "--all only works with `rm'\n" if $opt{all} && $train ne 'rm';
 
 my $spamc = PublicInbox::Spamcheck::Spamc->new;
 my $pi_config = PublicInbox::Config->new;
@@ -68,12 +73,12 @@ 	$im->done;
 }
 
 # spam is removed from all known inboxes since it is often Bcc:-ed
-if ($train eq 'spam') {
+if ($train eq 'spam' || ($train eq 'rm' && $opt{all})) {
 	$pi_config->each_inbox(sub {
 		my ($ibx) = @_;
 		$ibx = PublicInbox::InboxWritable->new($ibx);
 		my $im = $ibx->importer(0);
-		$im->remove($mime, 'spam');
+		$im->remove($mime, $train);
 		$im->done;
 	});
 } else {