symfony
diff --git a/‎src/Symfony/Component/Mailer/EventListener/MessageListener.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/EventListener/MessageListener.php
+1-1Lines changed: 1 addition & 1 deletion b/‎src/Symfony/Component/Mailer/EventListener/MessageListener.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/EventListener/MessageListener.php
+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎src/Symfony/Component/Mailer/Tests/EventListener/MessageListenerTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/Tests/EventListener/MessageListenerTest.php
+12Lines changed: 12 additions & 0 deletions b/‎src/Symfony/Component/Mailer/Tests/EventListener/MessageListenerTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/Tests/EventListener/MessageListenerTest.php
+12Lines changed: 12 additions & 0 deletions
@@ -58,7 +58,7 @@ public function addHeaderRule(string $headerName, int $rule): void
             throw new InvalidArgumentException(sprintf('The "%d" rule is not supported.', $rule));
         }
 
-        $this->headerRules[$headerName] = $rule;
+        $this->headerRules[strtolower($headerName)] = $rule;
     }
 
     public function onMessage(MessageEvent $event): void
 
@@ -101,5 +101,17 @@ public function provideHeaders(): iterable
             ->add(new MailboxListHeader('bcc', [new Address('bcc-initial@example.com'), new Address('bcc-default@example.com'), new Address('bcc-default-1@example.com')]))
         ;
         yield 'bcc, add another bcc (unique header)' => [$initialHeaders, $defaultHeaders, $expectedHeaders];
+
+        $initialHeaders = (new Headers())
+            ->add(new UnstructuredHeader('foo', 'initial'))
+        ;
+        $defaultHeaders = (new Headers())
+            ->add(new UnstructuredHeader('foo', 'bar'))
+            ->add(new UnstructuredHeader('bar', 'foo'))
+        ;
+        $rules = [
+            'Foo' => MessageListener::HEADER_REPLACE,
+        ];
+        yield 'Capitalized header rule (case-insensitive), replace if set' => [$initialHeaders, $defaultHeaders, $defaultHeaders, $rules];
     }
 }
Original file line number	Diff line number	Diff line change
`@@ -58,7 +58,7 @@ public function addHeaderRule(string $headerName, int $rule): void`
`58`	`58`	`throw new InvalidArgumentException(sprintf('The "%d" rule is not supported.', $rule));`
`59`	`59`	`}`
`60`	`60`
`61`		`- $this->headerRules[$headerName] = $rule;`
	`61`	`+ $this->headerRules[strtolower($headerName)] = $rule;`
`62`	`62`	`}`
`63`	`63`
`64`	`64`	`public function onMessage(MessageEvent $event): void`
Original file line number	Diff line number	Diff line change
`@@ -101,5 +101,17 @@ public function provideHeaders(): iterable`
`101`	`101`	`->add(new MailboxListHeader('bcc', [new Address('bcc-initial@example.com'), new Address('bcc-default@example.com'), new Address('bcc-default-1@example.com')]))`
`102`	`102`	`;`
`103`	`103`	`yield 'bcc, add another bcc (unique header)' => [$initialHeaders, $defaultHeaders, $expectedHeaders];`
	`104`	`+`
	`105`	`+ $initialHeaders = (new Headers())`
	`106`	`+ ->add(new UnstructuredHeader('foo', 'initial'))`
	`107`	`+ ;`
	`108`	`+ $defaultHeaders = (new Headers())`
	`109`	`+ ->add(new UnstructuredHeader('foo', 'bar'))`
	`110`	`+ ->add(new UnstructuredHeader('bar', 'foo'))`
	`111`	`+ ;`
	`112`	`+ $rules = [`
	`113`	`+ 'Foo' => MessageListener::HEADER_REPLACE,`
	`114`	`+ ];`
	`115`	`+ yield 'Capitalized header rule (case-insensitive), replace if set' => [$initialHeaders, $defaultHeaders, $defaultHeaders, $rules];`
`104`	`116`	`}`
`105`	`117`	`}`