diff --git a/parsemail.go b/parsemail.go
index 6a60192..e752dd3 100644
--- a/parsemail.go
+++ b/parsemail.go
@@ -345,7 +345,7 @@ func decodeAttachment(part *multipart.Part) (at Attachment, err error) {
 }
 
 func decodeContent(content io.Reader, encoding string) (io.Reader, error) {
-	switch encoding {
+	switch strings.ToLower(encoding) {
 	case "base64":
 		decoded := base64.NewDecoder(base64.StdEncoding, content)
 		b, err := ioutil.ReadAll(decoded)
diff --git a/parsemail_test.go b/parsemail_test.go
index 109e734..cb088aa 100644
--- a/parsemail_test.go
+++ b/parsemail_test.go
@@ -403,6 +403,34 @@ So, "Hello".`,
 			htmlBody:  "<div dir=\"ltr\"><div>Time for the egg.</div><div><br></div><div><br><br></div></div>",
 			textBody: "Time for the egg.",
 		},
+		14: {
+			mailData:    data3,
+			contentType: `multipart/mixed; boundary=f403045f1dcc043a44054c8e6bbf`,
+			content:     "",
+			subject:     "Peter Paholík",
+			from: []mail.Address{
+				{
+					Name:    "Peter Paholík",
+					Address: "peter.paholik@gmail.com",
+				},
+			},
+			to: []mail.Address{
+				{
+					Name:    "",
+					Address: "dusan@kasan.sk",
+				},
+			},
+			messageID: "CACtgX4kNXE7T5XKSKeH_zEcfUUmf2vXVASxYjaaK9cCn-3zb_g@mail.gmail.com",
+			date:      parseDate("Fri, 07 Apr 2017 09:17:26 +0200"),
+			htmlBody:  "<div dir=\"ltr\"><br></div>",
+			attachments: []attachmentData{
+				{
+					filename:    "Peter Paholík 1 4 2017 2017-04-07.json",
+					contentType: "application/json",
+					data:        "[1, 2, 3]",
+				},
+			},
+		},
 	}
 
 	for index, td := range testData {
@@ -750,6 +778,41 @@ YKUKF+Os3baUndC0pDnwNAmLy1SUr2Gw0luxQuV/AwC6cEhVV5VRrwAAAABJRU5ErkJggg==
 --------------C70C0458A558E585ACB75FB4--
 `
 
+var data3 = `From: =?UTF-8?Q?Peter_Pahol=C3=ADk?= <peter.paholik@gmail.com>
+Date: Fri, 7 Apr 2017 09:17:26 +0200
+Message-ID: <CACtgX4kNXE7T5XKSKeH_zEcfUUmf2vXVASxYjaaK9cCn-3zb_g@mail.gmail.com>
+Subject: =?UTF-8?Q?Peter_Pahol=C3=ADk?=
+To: dusan@kasan.sk
+Content-Type: multipart/mixed; boundary=f403045f1dcc043a44054c8e6bbf
+
+--f403045f1dcc043a44054c8e6bbf
+Content-Type: multipart/alternative; boundary=f403045f1dcc043a3f054c8e6bbd
+
+--f403045f1dcc043a3f054c8e6bbd
+Content-Type: text/plain; charset=UTF-8
+
+
+
+--f403045f1dcc043a3f054c8e6bbd
+Content-Type: text/html; charset=UTF-8
+
+<div dir="ltr"><br></div>
+
+--f403045f1dcc043a3f054c8e6bbd--
+--f403045f1dcc043a44054c8e6bbf
+Content-Type: application/json;
+	name="=?UTF-8?Q?Peter_Paholi=CC=81k_1?=
+	=?UTF-8?Q?_4_2017_2017=2D04=2D07=2Ejson?="
+Content-Disposition: attachment;
+	filename="=?UTF-8?Q?Peter_Paholi=CC=81k_1?=
+	=?UTF-8?Q?_4_2017_2017=2D04=2D07=2Ejson?="
+Content-Transfer-Encoding: BASE64
+X-Attachment-Id: f_j17i0f0d0
+
+WzEsIDIsIDNd
+--f403045f1dcc043a44054c8e6bbf--
+`
+
 var textPlainInMultipart = `From: Rares <rares@example.com>
 Date: Thu, 2 May 2019 11:25:35 +0300
 Subject: Re: kern/54143 (virtualbox)