diff --git a/src/main/kotlin/org/disposableemail/DisposableEmail.kt b/src/main/kotlin/org/disposableemail/DisposableEmail.kt
index e2c16cb..6eb4547 100644
--- a/src/main/kotlin/org/disposableemail/DisposableEmail.kt
+++ b/src/main/kotlin/org/disposableemail/DisposableEmail.kt
@@ -11,7 +11,6 @@ import java.io.BufferedReader
 import java.io.IOException
 import java.io.InputStream
 import java.io.InputStreamReader
-import kotlin.reflect.KFunction1
 
 class DisposableEmail private constructor() {
     private val maxDomains = 200_000
@@ -40,7 +39,7 @@ class DisposableEmail private constructor() {
          * Verify the given email address is a Disposable mail box. Also, check the given email actually exists
          *
          */
-        fun isDisposableEmail(email: String, checkDns: Boolean = false, dnsResolver: DNS_RESOLVER_TYPE = DNS_RESOLVER_TYPE.CLOUD_FLARE): Boolean {
+        fun isDisposableEmail(email: String, checkDns: Boolean = true, dnsResolver: DNS_RESOLVER_TYPE = DNS_RESOLVER_TYPE.CLOUD_FLARE): Boolean {
             val domain = getInstance().extractDomain(email)
             if (getInstance().isDisposable(domain)) {
                 return true
@@ -64,7 +63,10 @@ class DisposableEmail private constructor() {
             getInstance().blackListedDomains.remove(domain)
         }
 
-        fun refreshDisposableDomains(performGc: Boolean = false) {
+        /**
+         * Download latest disposable email domain list from Github
+         */
+        fun refreshDisposableDomains(performGc: Boolean = true) {
             getInstance().refreshDisposableDomains(performGc)
         }
     }
@@ -72,7 +74,7 @@ class DisposableEmail private constructor() {
     /**
      * By providing email address, it returns whether the domain is a disposable domain
      *
-     * @param email - Email Address
+     * @param domain - domain of a Email Address
      */
     fun isDisposable(domain: String): Boolean {
         if (whiteListedDomains.contains(domain)) {
@@ -149,7 +151,6 @@ class DisposableEmail private constructor() {
 
             // Swap
             bloomFilter = tempBloomFilter
-            println("Data refresh completed..")
         }
         response.body?.close()
         if (performGc)
diff --git a/src/main/kotlin/org/disposableemail/dnsoverhttps/DnsResolver.kt b/src/main/kotlin/org/disposableemail/dnsoverhttps/DnsResolver.kt
index f6efd46..df94f8e 100644
--- a/src/main/kotlin/org/disposableemail/dnsoverhttps/DnsResolver.kt
+++ b/src/main/kotlin/org/disposableemail/dnsoverhttps/DnsResolver.kt
@@ -4,20 +4,25 @@ import com.google.gson.Gson
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import org.disposableemail.Configurations
+import java.io.IOException
+import kotlin.jvm.Throws
 
 class DnsResolver {
     companion object {
         private val client = OkHttpClient()
         private val gson: Gson = Gson()
 
+        @Throws(IOException::class)
         fun verifyMxRecordPresent(domain: String, dnsResolver: DNS_RESOLVER_TYPE): Boolean {
+            val url = "${getResolverUrl(dnsResolver)}?type=MX&name=$domain"
             val request = Request.Builder()
-                .url(getResolverUrl(dnsResolver))
+                .url(url)
+                .addHeader("Accept", "application/dns-json")
                 .build();
-
             val response = client.newCall(request).execute()
             response.body?.let {
-                val resp = gson.fromJson(it.string(), DnsResponse::class.java)
+                val body = it.string()
+                val resp = gson.fromJson(body, DnsResponse::class.java)
                 return !resp.Answer.isNullOrEmpty()
             }
             return false