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diff --git a/comm/mailnews/mime/test/unit/test_bug493544.js b/comm/mailnews/mime/test/unit/test_bug493544.js
new file mode 100644
index 0000000000..f0da7ef167
--- /dev/null
+++ b/comm/mailnews/mime/test/unit/test_bug493544.js
@@ -0,0 +1,106 @@
+//
+// Tests if a multi-line MIME header is parsed even if it violates RFC 2047
+//
+
+var { MailServices } = ChromeUtils.import(
+  "resource:///modules/MailServices.jsm"
+);
+
+function run_test() {
+  const headers = [
+    {
+      // Bug 833028
+      encoded:
+        "Subject: AAA =?UTF-8?Q?bbb?= CCC =?UTF-8?Q?ddd?= EEE =?UTF-8?Q?fff?= GGG",
+      defaultCharset: "UTF-8",
+      overrideCharset: false,
+      eatContinuation: false,
+      decoded: "Subject: AAA bbb CCC ddd EEE fff GGG",
+    },
+    {
+      // Bug 493544
+      encoded:
+        "Subject: =?UTF-8?B?4oiAICDiiIEgIOKIgiAg4oiDICDiiIQgIOKIhSAg4oiGICDiiIcgIOKIiCAg?=\n" +
+        " =?UTF-8?B?4oiJICDiiIogIOKIiyAg4oiMICDiiI0gIOKIjiAg4oiP?=",
+      defaultCharset: "UTF-8",
+      overrideCharset: false,
+      eatContinuation: false,
+      decoded: "Subject: ∀  ∁  ∂  ∃  ∄  ∅  ∆  ∇  ∈  ∉  ∊  ∋  ∌  ∍  ∎  ∏",
+    },
+    {
+      // Bug 476741
+      encoded:
+        "Subject: =?utf-8?Q?=E2=88=80__=E2=88=81__=E2=88=82__=E2=88=83__=E2=88=84__=E2?=\n" +
+        " =?utf-8?Q?=88=85__=E2=88=86__=E2=88=87__=E2=88=88__=E2=88=89__=E2=88?=\n" +
+        " =?utf-8?Q?=8A__=E2=88=8B__=E2=88=8C__=E2=88=8D__=E2=88=8E__=E2=88=8F?=",
+      defaultCharset: "UTF-8",
+      overrideCharset: false,
+      eatContinuation: false,
+      decoded: "Subject: ∀  ∁  ∂  ∃  ∄  ∅  ∆  ∇  ∈  ∉  ∊  ∋  ∌  ∍  ∎  ∏",
+    },
+    {
+      // Normal case
+      encoded:
+        "Subject: =?UTF-8?B?4oiAICDiiIEgIOKIgiAg4oiDICDiiIQgIOKIhSAg4oiGICDiiIcgIOKIiA==?=\n" +
+        " =?UTF-8?B?ICDiiIkgIOKIiiAg4oiLICDiiIwgIOKIjSAg4oiOICDiiI8=?=",
+      defaultCharset: "UTF-8",
+      overrideCharset: false,
+      eatContinuation: false,
+      decoded: "Subject: ∀  ∁  ∂  ∃  ∄  ∅  ∆  ∇  ∈  ∉  ∊  ∋  ∌  ∍  ∎  ∏",
+    },
+    {
+      // Normal case with the encoding character in lower case
+      encoded:
+        "Subject: =?UTF-8?b?4oiAICDiiIEgIOKIgiAg4oiDICDiiIQgIOKIhSAg4oiGICDiiIcgIOKIiA==?=\n" +
+        " =?UTF-8?b?ICDiiIkgIOKIiiAg4oiLICDiiIwgIOKIjSAg4oiOICDiiI8=?=",
+      defaultCharset: "UTF-8",
+      overrideCharset: false,
+      eatContinuation: false,
+      decoded: "Subject: ∀  ∁  ∂  ∃  ∄  ∅  ∆  ∇  ∈  ∉  ∊  ∋  ∌  ∍  ∎  ∏",
+    },
+    {
+      // Normal case
+      encoded:
+        "Subject: =?utf-8?Q?=E2=88=80__=E2=88=81__=E2=88=82__=E2=88=83__=E2=88=84__?=\n" +
+        " =?utf-8?Q?=E2=88=85__=E2=88=86__=E2=88=87__=E2=88=88__=E2=88=89__?=\n" +
+        " =?utf-8?Q?=E2=88=8A__=E2=88=8B__=E2=88=8C__=E2=88=8D__=E2=88=8E__?=\n" +
+        " =?utf-8?Q?=E2=88=8F?=",
+      defaultCharset: "UTF-8",
+      overrideCharset: false,
+      eatContinuation: false,
+      decoded: "Subject: ∀  ∁  ∂  ∃  ∄  ∅  ∆  ∇  ∈  ∉  ∊  ∋  ∌  ∍  ∎  ∏",
+    },
+    {
+      // Normal case with the encoding character in lower case
+      encoded:
+        "Subject: =?utf-8?q?=E2=88=80__=E2=88=81__=E2=88=82__=E2=88=83__=E2=88=84__?=\n" +
+        " =?utf-8?q?=E2=88=85__=E2=88=86__=E2=88=87__=E2=88=88__=E2=88=89__?=\n" +
+        " =?utf-8?q?=E2=88=8A__=E2=88=8B__=E2=88=8C__=E2=88=8D__=E2=88=8E__?=\n" +
+        " =?utf-8?q?=E2=88=8F?=",
+      defaultCharset: "UTF-8",
+      overrideCharset: false,
+      eatContinuation: false,
+      decoded: "Subject: ∀  ∁  ∂  ∃  ∄  ∅  ∆  ∇  ∈  ∉  ∊  ∋  ∌  ∍  ∎  ∏",
+    },
+    {
+      // Regression test for bug 227290
+      encoded:
+        "Subject: =?UTF-8?B?4oiAICDiiIEgIOKIgiAg4oiDICDiiIQgIOKIhSAg4oiGICDiiIcgIOKIiA===?=\n" +
+        " =?UTF-8?B?ICDiiIkgIOKIiiAg4oiLICDiiIwgIOKIjSAg4oiOICDiiI8=?=",
+      defaultCharset: "UTF-8",
+      overrideCharset: false,
+      eatContinuation: false,
+      decoded: "Subject: ∀  ∁  ∂  ∃  ∄  ∅  ∆  ∇  ∈  ∉  ∊  ∋  ∌  ∍  ∎  ∏",
+    },
+  ];
+
+  for (let i = 0; i < headers.length; ++i) {
+    let decoded = MailServices.mimeConverter.decodeMimeHeader(
+      headers[i].encoded,
+      headers[i].defaultCharset,
+      headers[i].overrideCharset,
+      headers[i].eatContinuation
+    );
+    Assert.equal(decoded, headers[i].decoded);
+  }
+}