diff --git a/src/Mailgun/Connection/Exceptions/GenericHTTPError.php b/src/Mailgun/Connection/Exceptions/GenericHTTPError.php
index d3239d1..fc9560e 100644
--- a/src/Mailgun/Connection/Exceptions/GenericHTTPError.php
+++ b/src/Mailgun/Connection/Exceptions/GenericHTTPError.php
@@ -11,6 +11,9 @@ namespace Mailgun\Connection\Exceptions;
 
 use Mailgun\Exception;
 
+/**
+ * @deprecated Will be removed in 3.0
+ */
 class GenericHTTPError extends \Exception implements Exception
 {
     protected $httpResponseCode;
diff --git a/src/Mailgun/Connection/Exceptions/InvalidCredentials.php b/src/Mailgun/Connection/Exceptions/InvalidCredentials.php
index b4fdf02..fad86fe 100644
--- a/src/Mailgun/Connection/Exceptions/InvalidCredentials.php
+++ b/src/Mailgun/Connection/Exceptions/InvalidCredentials.php
@@ -11,6 +11,9 @@ namespace Mailgun\Connection\Exceptions;
 
 use Mailgun\Exception;
 
+/**
+ * @deprecated Will be removed in 3.0
+ */
 class InvalidCredentials extends \Exception implements Exception
 {
 }
diff --git a/src/Mailgun/Connection/Exceptions/MissingEndpoint.php b/src/Mailgun/Connection/Exceptions/MissingEndpoint.php
index abcf8a1..d2ce149 100644
--- a/src/Mailgun/Connection/Exceptions/MissingEndpoint.php
+++ b/src/Mailgun/Connection/Exceptions/MissingEndpoint.php
@@ -11,6 +11,9 @@ namespace Mailgun\Connection\Exceptions;
 
 use Mailgun\Exception;
 
+/**
+ * @deprecated Will be removed in 3.0
+ */
 class MissingEndpoint extends \Exception implements Exception
 {
 }
diff --git a/src/Mailgun/Connection/Exceptions/MissingRequiredParameters.php b/src/Mailgun/Connection/Exceptions/MissingRequiredParameters.php
index 25658b5..939c761 100644
--- a/src/Mailgun/Connection/Exceptions/MissingRequiredParameters.php
+++ b/src/Mailgun/Connection/Exceptions/MissingRequiredParameters.php
@@ -11,6 +11,9 @@ namespace Mailgun\Connection\Exceptions;
 
 use Mailgun\Exception;
 
+/**
+ * @deprecated Will be removed in 3.0
+ */
 class MissingRequiredParameters extends \Exception implements Exception
 {
 }
diff --git a/src/Mailgun/Connection/Exceptions/NoDomainsConfigured.php b/src/Mailgun/Connection/Exceptions/NoDomainsConfigured.php
index a2a1015..4ee6a3b 100644
--- a/src/Mailgun/Connection/Exceptions/NoDomainsConfigured.php
+++ b/src/Mailgun/Connection/Exceptions/NoDomainsConfigured.php
@@ -11,6 +11,9 @@ namespace Mailgun\Connection\Exceptions;
 
 use Mailgun\Exception;
 
+/**
+ * @deprecated Will be removed in 3.0
+ */
 class NoDomainsConfigured extends \Exception implements Exception
 {
 }
diff --git a/src/Mailgun/Connection/RestClient.php b/src/Mailgun/Connection/RestClient.php
index bc44e15..8000000 100644
--- a/src/Mailgun/Connection/RestClient.php
+++ b/src/Mailgun/Connection/RestClient.php
@@ -23,6 +23,8 @@ use Psr\Http\Message\ResponseInterface;
 
 /**
  * This class is a wrapper for the HTTP client.
+ *
+ * @deprecated Will be removed in 3.0
  */
 class RestClient
 {
diff --git a/src/Mailgun/Mailgun.php b/src/Mailgun/Mailgun.php
index 2fae224..9468778 100644
--- a/src/Mailgun/Mailgun.php
+++ b/src/Mailgun/Mailgun.php
@@ -104,6 +104,8 @@ class Mailgun
      * @throws Exceptions\MissingRequiredMIMEParameters
      *
      * @return \stdClass
+     *
+     * @deprecated Use Mailgun->message() instead. Will be removed in 3.0
      */
     public function sendMessage($workingDomain, $postData, $postFiles = [])
     {
@@ -137,6 +139,8 @@ class Mailgun
      * @param array|null $postData
      *
      * @return bool
+     *
+     * @deprecated Use Mailgun->webhook() instead. Will be removed in 3.0
      */
     public function verifyWebhookSignature($postData = null)
     {
@@ -162,6 +166,8 @@ class Mailgun
      * @param array  $files
      *
      * @return \stdClass
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function post($endpointUrl, $postData = [], $files = [])
     {
@@ -173,6 +179,8 @@ class Mailgun
      * @param array  $queryString
      *
      * @return \stdClass
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function get($endpointUrl, $queryString = [])
     {
@@ -183,6 +191,8 @@ class Mailgun
      * @param string $url
      *
      * @return \stdClass
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function getAttachment($url)
     {
@@ -193,6 +203,8 @@ class Mailgun
      * @param string $endpointUrl
      *
      * @return \stdClass
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function delete($endpointUrl)
     {
@@ -204,6 +216,8 @@ class Mailgun
      * @param array  $putData
      *
      * @return \stdClass
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function put($endpointUrl, $putData)
     {
@@ -214,6 +228,8 @@ class Mailgun
      * @param string $apiVersion
      *
      * @return Mailgun
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function setApiVersion($apiVersion)
     {
@@ -238,6 +254,8 @@ class Mailgun
 
     /**
      * @return MessageBuilder
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function MessageBuilder()
     {
@@ -246,6 +264,8 @@ class Mailgun
 
     /**
      * @return OptInHandler
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function OptInHandler()
     {
@@ -257,6 +277,8 @@ class Mailgun
      * @param bool   $autoSend
      *
      * @return BatchMessage
+     *
+     * @deprecated Will be removed in 3.0
      */
     public function BatchMessage($workingDomain, $autoSend = true)
     {