diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7025194b..ab519460 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,7 +18,10 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
-- Nothing.
+- [#93](https://github.com/zendframework/zend-mail/pull/93) fixes a situation
+  whereby `getSender()` was unintentionally creating a blank `Sender` header,
+  instead of returning `null` if none exists, fixing an issue in the SMTP
+  transport.
 
 ## 2.7.2 - 2016-12-19
 
diff --git a/src/Message.php b/src/Message.php
index a1ed1243..55e14bb1 100644
--- a/src/Message.php
+++ b/src/Message.php
@@ -314,6 +314,10 @@ public function setSender($emailOrAddress, $name = null)
      */
     public function getSender()
     {
+        $headers = $this->getHeaders();
+        if (! $headers->has('sender')) {
+            return null;
+        }
         $header = $this->getHeaderByName('sender', __NAMESPACE__ . '\Header\Sender');
         return $header->getAddress();
     }
diff --git a/test/MessageTest.php b/test/MessageTest.php
index f3492e7d..fe858f1e 100644
--- a/test/MessageTest.php
+++ b/test/MessageTest.php
@@ -158,6 +158,13 @@ public function testSenderIsNullByDefault()
         $this->assertNull($this->message->getSender());
     }
 
+    public function testNullSenderDoesNotCreateHeader()
+    {
+        $sender = $this->message->getSender();
+        $headers = $this->message->getHeaders();
+        $this->assertFalse($headers->has('sender'));
+    }
+
     public function testSettingSenderCreatesAddressObject()
     {
         $this->message->setSender('zf-devteam@example.com');
diff --git a/test/Transport/SmtpTest.php b/test/Transport/SmtpTest.php
index 90ddc00e..7978057e 100644
--- a/test/Transport/SmtpTest.php
+++ b/test/Transport/SmtpTest.php
@@ -37,19 +37,21 @@ public function setUp()
     public function getMessage()
     {
         $message = new Message();
-        $message->addTo('zf-devteam@zend.com', 'ZF DevTeam')
-                ->addCc('matthew@zend.com')
-                ->addBcc('zf-crteam@lists.zend.com', 'CR-Team, ZF Project')
-                ->addFrom([
-                    'zf-devteam@zend.com',
-                    'matthew@zend.com' => 'Matthew',
-                ])
-                ->setSender('ralph.schindler@zend.com', 'Ralph Schindler')
-                ->setSubject('Testing Zend\Mail\Transport\Sendmail')
-                ->setBody('This is only a test.');
+        $message->addTo('zf-devteam@zend.com', 'ZF DevTeam');
+        $message->addCc('matthew@zend.com');
+        $message->addBcc('zf-crteam@lists.zend.com', 'CR-Team, ZF Project');
+        $message->addFrom([
+            'zf-devteam@zend.com',
+            'matthew@zend.com' => 'Matthew',
+        ]);
+        $message->setSender('ralph.schindler@zend.com', 'Ralph Schindler');
+        $message->setSubject('Testing Zend\Mail\Transport\Sendmail');
+        $message->setBody('This is only a test.');
+
         $message->getHeaders()->addHeaders([
             'X-Foo-Bar' => 'Matthew',
         ]);
+
         return $message;
     }
 
@@ -135,18 +137,40 @@ public function testSendMinimalMail()
     {
         $headers = new Headers();
         $headers->addHeaderLine('Date', 'Sun, 10 Jun 2012 20:07:24 +0200');
+
+        $message = new Message();
+        $message->setHeaders($headers);
+        $message->setSender('ralph.schindler@zend.com', 'Ralph Schindler');
+        $message->setBody('testSendMailWithoutMinimalHeaders');
+        $message->addTo('zf-devteam@zend.com', 'ZF DevTeam');
+
+        $expectedMessage = "Date: Sun, 10 Jun 2012 20:07:24 +0200\r\n"
+            . "Sender: Ralph Schindler <ralph.schindler@zend.com>\r\n"
+            . "To: ZF DevTeam <zf-devteam@zend.com>\r\n"
+            . "\r\n"
+            . "testSendMailWithoutMinimalHeaders";
+
+        $this->transport->send($message);
+
+        $this->assertContains($expectedMessage, $this->connection->getLog());
+    }
+
+    public function testSendMinimalMailWithoutSender()
+    {
+        $headers = new Headers();
+        $headers->addHeaderLine('Date', 'Sun, 10 Jun 2012 20:07:24 +0200');
+
         $message = new Message();
-        $message
-            ->setHeaders($headers)
-            ->setSender('ralph.schindler@zend.com', 'Ralph Schindler')
-            ->setBody('testSendMailWithoutMinimalHeaders')
-            ->addTo('zf-devteam@zend.com', 'ZF DevTeam')
-        ;
+        $message->setHeaders($headers);
+        $message->setFrom('ralph.schindler@zend.com', 'Ralph Schindler');
+        $message->setBody('testSendMinimalMailWithoutSender');
+        $message->addTo('zf-devteam@zend.com', 'ZF DevTeam');
+
         $expectedMessage = "Date: Sun, 10 Jun 2012 20:07:24 +0200\r\n"
-                           . "Sender: Ralph Schindler <ralph.schindler@zend.com>\r\n"
-                           . "To: ZF DevTeam <zf-devteam@zend.com>\r\n"
-                           . "\r\n"
-                           . "testSendMailWithoutMinimalHeaders";
+            . "From: Ralph Schindler <ralph.schindler@zend.com>\r\n"
+            . "To: ZF DevTeam <zf-devteam@zend.com>\r\n"
+            . "\r\n"
+            . "testSendMinimalMailWithoutSender";
 
         $this->transport->send($message);