From bccf2161f9ad78d0bb28867ce6ccda8f016198c5 Mon Sep 17 00:00:00 2001
From: Gaurav Nanda <gaurav.nanda@saaslabs.co>
Date: Wed, 12 Apr 2023 12:46:17 +0530
Subject: [PATCH] Fix Helo problems with Spamhaus

---
 package.json           | 2 +-
 src/index.ts           | 2 +-
 src/options/options.ts | 1 +
 src/smtp/smtp.ts       | 9 +++++++--
 4 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/package.json b/package.json
index f85d901..eb36396 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "deep-email-validator",
-  "version": "0.1.22",
+  "version": "0.1.23",
   "files": [
     "dist/**/*"
   ],
diff --git a/src/index.ts b/src/index.ts
index e7b27ea..94810d3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -32,7 +32,7 @@ export async function validate(emailOrOptions: string | ValidatorOptions): Promi
     const mx = await getBestMx(domain)
     if (!mx) return createOutput('mx', 'MX record not found')
     if (options.validateSMTP) {
-      return checkSMTP(options.sender, email, mx.exchange)
+      return checkSMTP(options.sender, email, mx.exchange, options.helo)
     }
   }
 
diff --git a/src/options/options.ts b/src/options/options.ts
index 1fb46ce..814c423 100644
--- a/src/options/options.ts
+++ b/src/options/options.ts
@@ -15,6 +15,7 @@ type Options = {
   validateTypo: boolean
   validateDisposable: boolean
   validateSMTP: boolean
+  helo?: string
 }
 
 type MailCheckOptions = {
diff --git a/src/smtp/smtp.ts b/src/smtp/smtp.ts
index 9aeb07c..4e561b0 100644
--- a/src/smtp/smtp.ts
+++ b/src/smtp/smtp.ts
@@ -8,7 +8,12 @@ const log = (...args: unknown[]) => {
   }
 }
 
-export const checkSMTP = async (sender: string, recipient: string, exchange: string): Promise<OutputFormat> => {
+export const checkSMTP = async (
+  sender: string,
+  recipient: string,
+  exchange: string,
+  helo?: string
+): Promise<OutputFormat> => {
   const timeout = 1000 * 10 // 10 seconds
   return new Promise(r => {
     let receivedData = false
@@ -48,7 +53,7 @@ export const checkSMTP = async (sender: string, recipient: string, exchange: str
       r(createOutput())
     })
 
-    const commands = [`helo ${exchange}\r\n`, `mail from: <${sender}>\r\n`, `rcpt to: <${recipient}>\r\n`]
+    const commands = [`helo ${helo || exchange}\r\n`, `mail from: <${sender}>\r\n`, `rcpt to: <${recipient}>\r\n`]
     let i = 0
     socket.on('next', () => {
       if (i < 3) {