diff --git a/scripts/irods/test/test_misc.py b/scripts/irods/test/test_misc.py
index 236035e03a..59c489d9e4 100644
--- a/scripts/irods/test/test_misc.py
+++ b/scripts/irods/test/test_misc.py
@@ -492,6 +492,14 @@ def test_enabling_and_disabling_of_msiSendMail__issue_7651(self):
             self.assertIn('enable_deprecated_msiSendMail', config.server_config['advanced_settings'])
             self.user.assert_icommand(['irule', '-r', rep_name, rule, 'null', 'ruleExecOut'], 'STDERR', ['-169000 SYS_NOT_ALLOWED'])
 
+        # Show use of msiSendMail is blocked when the configuration option is set to something
+        # other than a boolean.
+        with lib.file_backed_up(config.server_config_path):
+            config.server_config['advanced_settings']['enable_deprecated_msiSendMail'] = 'not_a_boolean'
+            lib.update_json_file_from_dict(config.server_config_path, config.server_config)
+            self.assertIn('enable_deprecated_msiSendMail', config.server_config['advanced_settings'])
+            self.user.assert_icommand(['irule', '-r', rep_name, rule, 'null', 'ruleExecOut'], 'STDERR', ['-169000 SYS_NOT_ALLOWED'])
+
         # Show use of msiSendMail is allowed when the configuration option is set to true.
         with lib.file_backed_up(config.server_config_path):
             config.server_config['advanced_settings']['enable_deprecated_msiSendMail'] = True