--- /dev/null
+#!/usr/bin/env bash
+
+test_description='S/MIME signature verification and decryption'
+. ./test-lib.sh || exit 1
+
+test_require_external_prereq openssl
+test_require_external_prereq gpgsm
+
+cp $TEST_DIRECTORY/smime/key+cert.pem test_suite.pem
+
+FINGERPRINT=$(openssl x509 -fingerprint -in test_suite.pem -noout | sed -e 's/^.*=//' -e s/://g)
+
+test_expect_success 'emacs delivery of S/MIME signed message' \
+ 'emacs_fcc_message \
+ "test signed message 001" \
+ "This is a test signed message." \
+ "(mml-secure-message-sign \"smime\")"'
+
+# Hard code the MML to avoid several interactive questions
+test_expect_success 'emacs delivery of S/MIME encrypted + signed message' \
+'emacs_fcc_message \
+ "test encrypted message 001" \
+ "<#secure method=smime mode=signencrypt keyfile=\\\"test_suite.pem\\\" certfile=\\\"test_suite.pem\\\">\nThis is a test encrypted message.\n"'
+
+test_begin_subtest "Signature verification (openssl)"
+notmuch show --format=raw subject:"test signed message 001" |\
+ openssl smime -verify -CAfile $TEST_DIRECTORY/smime/test.crt 2>OUTPUT
+cat <<EOF > EXPECTED
+Verification successful
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "Decryption and signature verification (openssl)"
+notmuch show --format=raw subject:"test encrypted message 001" |\
+ openssl smime -decrypt -recip test_suite.pem |\
+ openssl smime -verify -CAfile $TEST_DIRECTORY/smime/test.crt 2>OUTPUT
+cat <<EOF > EXPECTED
+Verification successful
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_done