diff --git a/notmuch-reply.c b/notmuch-reply.c
index 2c30f6f9..ceb4f39b 100644
--- a/notmuch-reply.c
+++ b/notmuch-reply.c
@@ -65,8 +65,9 @@ format_part_reply (GMimeStream *stream, mime_node_t *node)
 	GMimeContentDisposition *disposition = g_mime_object_get_content_disposition (node->part);
 
 	if (g_mime_content_type_is_type (content_type, "application", "pgp-encrypted") ||
-	    g_mime_content_type_is_type (content_type, "application", "pgp-signature")) {
-	    /* Ignore PGP/MIME cruft parts */
+	    g_mime_content_type_is_type (content_type, "application", "pgp-signature") ||
+	    g_mime_content_type_is_type (content_type, "application", "pkcs7-mime")) {
+	    /* Ignore PGP/MIME and S/MIME cruft parts */
 	} else if (g_mime_content_type_is_type (content_type, "text", "*") &&
 		   ! g_mime_content_type_is_type (content_type, "text", "html")) {
 	    show_text_part_content (node->part, stream, NOTMUCH_SHOW_TEXT_PART_REPLY);
diff --git a/test/T355-smime.sh b/test/T355-smime.sh
index 03aada20..8d225bc1 100755
--- a/test/T355-smime.sh
+++ b/test/T355-smime.sh
@@ -156,7 +156,6 @@ OpenPGP Example Corp"
 test_expect_equal "$expected" "$output"
 
 test_begin_subtest "reply to PKCS#7 SignedData message with proper quoting and attribution"
-test_subtest_known_broken
 output=$(notmuch reply id:smime-onepart-signed@protected-headers.example)
 expected="From: Notmuch Test Suite <test_suite@notmuchmail.org>
 Subject: Re: The FooCorp contract