diff --git a/src/Header/Part/QuotedLiteralPart.php b/src/Header/Part/QuotedLiteralPart.php
index 2b1516fc..ad3a5de7 100644
--- a/src/Header/Part/QuotedLiteralPart.php
+++ b/src/Header/Part/QuotedLiteralPart.php
@@ -9,14 +9,38 @@
 
 /**
  * A quoted literal header string part.  The value of the part is stripped of CR
- * and LF characters, but otherwise not transformed or changed in any way.
+ * and LF characters, and whitespace between two adjacent MimeTokens is removed.
  *
  * @author Zaahid Bateson
  */
 class QuotedLiteralPart extends ContainerPart
 {
+    /**
+     * Strips spaces found between two adjacent MimeToken parts.
+     * Other whitespace is returned as-is.
+     *
+     * @param HeaderPart[] $parts
+     * @return HeaderPart[]
+     */
     protected function filterIgnoredSpaces(array $parts) : array
     {
-        return $parts;
+        $filtered = \array_reduce(
+            \array_keys($parts),
+            function($carry, $key) use ($parts) {
+                $cur = $parts[$key];
+                $last = ($carry !== null) ? \end($carry) : null;
+                $next = (count($parts) > $key + 1) ? $parts[$key + 1] : null;
+                if ($last !== null && $next !== null && $cur->isSpace && (
+                    $last->canIgnoreSpacesAfter
+                    && $next->canIgnoreSpacesBefore
+                    && $last instanceof MimeToken
+                    && $next instanceof MimeToken
+                )) {
+                    return $carry;
+                }
+                return \array_merge($carry ?? [], [$cur]);
+            }
+        );
+        return $filtered;
     }
 }
diff --git a/tests/MailMimeParser/Header/Consumer/ParameterValueConsumerServiceTest.php b/tests/MailMimeParser/Header/Consumer/ParameterValueConsumerServiceTest.php
index 237d6869..adc556a7 100644
--- a/tests/MailMimeParser/Header/Consumer/ParameterValueConsumerServiceTest.php
+++ b/tests/MailMimeParser/Header/Consumer/ParameterValueConsumerServiceTest.php
@@ -98,4 +98,16 @@ public function testWithQuotedHeaderEncodedValue() : void
         $ret = $this->consumer->__invoke('"=?US-ASCII?Q?value?="');
         $this->assertEquals('value', $ret[0]->getValue());
     }
+
+    public function testWithQuotedHeaderMultipleEncodedValues() : void
+    {
+        $ret = $this->consumer->__invoke('"=?US-ASCII?Q?Kilgore?= =?US-ASCII?Q?Trout?="');
+        $this->assertEquals('KilgoreTrout', $ret[0]->getValue());
+    }
+
+    public function testWithQuotedHeaderMultipleEncodedValuesAndLinesBetween() : void
+    {
+        $ret = $this->consumer->__invoke("\"=?US-ASCII?Q?Kilg?= \r\n =?US-ASCII?Q?or?=  =?US-ASCII?Q?e_Trout?=\"");
+        $this->assertEquals('Kilgore Trout', $ret[0]->getValue());
+    }
 }
diff --git a/tests/MailMimeParser/Header/Consumer/QuotedStringMimeLiteralPartConsumerServiceTest.php b/tests/MailMimeParser/Header/Consumer/QuotedStringMimeLiteralPartConsumerServiceTest.php
index 13e1ac42..70c96181 100644
--- a/tests/MailMimeParser/Header/Consumer/QuotedStringMimeLiteralPartConsumerServiceTest.php
+++ b/tests/MailMimeParser/Header/Consumer/QuotedStringMimeLiteralPartConsumerServiceTest.php
@@ -63,4 +63,20 @@ public function testConsumeMimeEncodedValue() : void
         $this->assertInstanceOf(QuotedLiteralPart::class, $ret[0]);
         $this->assertEquals('Kilgore Trout', $ret[0]->getValue());
     }
+
+    public function testWithQuotedHeaderMultipleEncodedValues() : void
+    {
+        $ret = $this->consumer->__invoke('=?US-ASCII?Q?Kilgore?= =?US-ASCII?Q?Trout?=');
+        $this->assertNotEmpty($ret);
+        $this->assertCount(1, $ret);
+        $this->assertEquals('KilgoreTrout', $ret[0]->getValue());
+    }
+
+    public function testWithQuotedHeaderMultipleEncodedValuesAndLinesBetween() : void
+    {
+        $ret = $this->consumer->__invoke("=?US-ASCII?Q?Kilg?= \r\n =?US-ASCII?Q?or?=  =?US-ASCII?Q?e_Trout?=");
+        $this->assertNotEmpty($ret);
+        $this->assertCount(1, $ret);
+        $this->assertEquals('Kilgore Trout', $ret[0]->getValue());
+    }
 }