Fix Helo problems with Spamhaus

package.json

@@ -1,6 +1,6 @@
 {
   "name": "deep-email-validator",
-  "version": "0.1.22",
+  "version": "0.1.23",
   "files": [
     "dist/**/*"
   ],

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)
     }
   }
 

src/options/options.ts

@@ -15,6 +15,7 @@ type Options = {
   validateTypo: boolean
   validateDisposable: boolean
   validateSMTP: boolean
+  helo?: string
 }
 
 type MailCheckOptions = {

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) {