diff --git a/package.json b/package.json
index baf9348..6674902 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,8 @@
     "ts-node": "^10.9.1",
     "typescript": "^4.8.3",
     "wagmi": "^0.6.8",
-    "web-vitals": "^2.1.4"
+    "web-vitals": "^2.1.4",
+    "yargs": "^17.7.1"
   },
   "resolutions": {
     "react-error-overlay": "6.0.9"
diff --git a/src/scripts/generate_input.ts b/src/scripts/generate_input.ts
index 08a3f11..5641dc4 100644
--- a/src/scripts/generate_input.ts
+++ b/src/scripts/generate_input.ts
@@ -18,11 +18,23 @@ import { shaHash, partialSha, sha256Pad } from "../../src/helpers/shaHash";
 import { dkimVerify } from "../../src/helpers/dkim";
 import * as fs from "fs";
 import { stubObject } from "lodash";
+import * as yargs from "yargs";
 var Cryo = require("cryo");
 const pki = require("node-forge").pki;
 
 // const email_file = "monia_email.eml"; // "./test_email.txt", "./twitter_msg.eml", kaylee_phone_number_email_twitter
-const email_file = "ethereum_eml.eml";
+const email = yargs
+  .option("email_file", {
+    alias: "e",
+    description: "Path to email file",
+    type: "string",
+    default: "test_sendgrid.eml",
+  })
+  .help()
+  .alias("help", "h").argv;
+
+const email_file = email.email_file;
+
 export interface ICircuitInputs {
   modulus?: string[];
   signature?: string[];
diff --git a/yarn.lock b/yarn.lock
index cbcec56..c12c177 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8364,6 +8364,7 @@ __metadata:
     typescript: ^4.8.3
     wagmi: ^0.6.8
     web-vitals: ^2.1.4
+    yargs: ^17.7.1
   languageName: unknown
   linkType: soft
 
@@ -21501,6 +21502,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"yargs@npm:^17.7.1":
+  version: 17.7.1
+  resolution: "yargs@npm:17.7.1"
+  dependencies:
+    cliui: ^8.0.1
+    escalade: ^3.1.1
+    get-caller-file: ^2.0.5
+    require-directory: ^2.1.1
+    string-width: ^4.2.3
+    y18n: ^5.0.5
+    yargs-parser: ^21.1.1
+  checksum: 3d8a43c336a4942bc68080768664aca85c7bd406f018bad362fd255c41c8f4e650277f42fd65d543fce99e084124ddafee7bbfc1a5c6a8fda4cec78609dcf8d4
+  languageName: node
+  linkType: hard
+
 "yauzl@npm:^2.10.0":
   version: 2.10.0
   resolution: "yauzl@npm:2.10.0"