diff --git a/src/mimeparser.rs b/src/mimeparser.rs
index 31085ce5c..fde537d69 100644
--- a/src/mimeparser.rs
+++ b/src/mimeparser.rs
@@ -969,9 +969,8 @@ fn get_recipients<'a, S: AsRef<str>, T: Iterator<Item = (S, S)>>(headers: T) ->
     let mut recipients: HashSet<String> = Default::default();
 
     for (hkey, hvalue) in headers {
-        let hkey = hkey.as_ref();
+        let hkey = hkey.as_ref().to_lowercase();
         let hvalue = hvalue.as_ref();
-
         if hkey == "to" || hkey == "cc" {
             if let Ok(addrs) = mailparse::addrparse(hvalue) {
                 for addr in addrs.iter() {
@@ -1058,6 +1057,17 @@ mod tests {
         assert_eq!(mimeparser.get_rfc724_mid(), None);
     }
 
+    #[test]
+    fn test_get_recipients() {
+        let context = dummy_context();
+        let raw = include_bytes!("../test-data/message/mail_with_cc.txt");
+        let mimeparser = MimeParser::from_bytes(&context.ctx, &raw[..]).unwrap();
+        let recipients = get_recipients(mimeparser.header.iter());
+        assert!(recipients.contains("abc@bcd.com"));
+        assert!(recipients.contains("def@def.de"));
+        assert_eq!(recipients.len(), 2);
+    }
+
     #[test]
     fn test_mailparse_content_type() {
         let ctype =
diff --git a/test-data/message/mail_with_cc.txt b/test-data/message/mail_with_cc.txt
new file mode 100644
index 000000000..02b749ffd
--- /dev/null
+++ b/test-data/message/mail_with_cc.txt
@@ -0,0 +1,14 @@
+Return-Path: <x@testrun.org>
+Received: from hq5.merlinux.eu
+	by hq5.merlinux.eu (Dovecot) with LMTP id yRKOBakcfV1AewAAPzvFDg
+	; Sat, 14 Sep 2019 19:00:25 +0200
+Received: from localhost (unknown 7.165.105.24])
+	by hq5.merlinux.eu (Postfix) with ESMTPSA id 8D9844E023;
+	Sat, 14 Sep 2019 19:00:22 +0200 (CEST)
+message-id: <2dfdbde7@example.org>
+Date: Sat, 14 Sep 2019 19:00:13 +0200
+From: lmn <x@tux.org>
+To: abc <abc@bcd.com>
+CC: def <def@def.de>
+
+hi