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diff --git a/comm/mailnews/mime/test/unit/test_nsIMsgHeaderParser3.js b/comm/mailnews/mime/test/unit/test_nsIMsgHeaderParser3.js
new file mode 100644
index 0000000000..06be599d93
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+++ b/comm/mailnews/mime/test/unit/test_nsIMsgHeaderParser3.js
@@ -0,0 +1,115 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Test suite for nsIMsgHeaderParser function removeDuplicateAddresses:
+ */
+
+var { MailServices } = ChromeUtils.import(
+  "resource:///modules/MailServices.jsm"
+);
+
+function run_test() {
+  const checks = [
+    {
+      addrs: "test@foo.invalid",
+      otherAddrs: "",
+      expectedResult: "test@foo.invalid",
+    },
+    {
+      addrs: "foo bar <test@foo.invalid>",
+      otherAddrs: "",
+      expectedResult: "foo bar <test@foo.invalid>",
+    },
+    {
+      addrs: "foo bar <test@foo.invalid>, abc@foo.invalid",
+      otherAddrs: "",
+      expectedResult: "foo bar <test@foo.invalid>, abc@foo.invalid",
+    },
+    {
+      addrs:
+        "foo bar <test@foo.invalid>, abc@foo.invalid, test <test@foo.invalid>",
+      otherAddrs: "",
+      expectedResult: "foo bar <test@foo.invalid>, abc@foo.invalid",
+    },
+    {
+      addrs: "foo bar <test@foo.invalid>",
+      otherAddrs: "abc@foo.invalid",
+      expectedResult: "foo bar <test@foo.invalid>",
+    },
+    {
+      addrs: "foo bar <test@foo.invalid>",
+      otherAddrs: "foo bar <test@foo.invalid>",
+      expectedResult: "",
+    },
+    {
+      addrs: "foo bar <test@foo.invalid>, abc@foo.invalid",
+      otherAddrs: "foo bar <test@foo.invalid>",
+      expectedResult: "abc@foo.invalid",
+    },
+    {
+      addrs: "foo bar <test@foo.invalid>, abc@foo.invalid",
+      otherAddrs: "abc@foo.invalid",
+      expectedResult: "foo bar <test@foo.invalid>",
+    },
+    {
+      addrs:
+        "foo bar <test@foo.invalid>, abc@foo.invalid, test <test@foo.invalid>",
+      otherAddrs: "abc@foo.invalid",
+      expectedResult: "foo bar <test@foo.invalid>",
+    },
+    // UTF-8 names
+    {
+      addrs: "foo\u00D0 bar <foo@bar.invalid>, \u00F6foo <ghj@foo.invalid>",
+      otherAddrs: "",
+      expectedResult:
+        "foo\u00D0 bar <foo@bar.invalid>, \u00F6foo <ghj@foo.invalid>",
+    },
+    {
+      addrs: "foo\u00D0 bar <foo@bar.invalid>, \u00F6foo <ghj@foo.invalid>",
+      otherAddrs: "foo\u00D0 bar <foo@bar.invalid>",
+      expectedResult: "\u00F6foo <ghj@foo.invalid>",
+    },
+    {
+      addrs:
+        "foo\u00D0 bar <foo@bar.invalid>, \u00F6foo <ghj@foo.invalid>, foo\u00D0 bar <foo@bar.invalid>",
+      otherAddrs: "\u00F6foo <ghj@foo.invalid>",
+      expectedResult: "foo\u00D0 bar <foo@bar.invalid>",
+    },
+    // Test email groups
+    {
+      addrs: "A group: foo bar <foo@bar.invalid>, foo <ghj@foo.invalid>;",
+      otherAddrs: "foo <ghj@foo.invalid>",
+      expectedResult: "A group: foo bar <foo@bar.invalid>;",
+    },
+    {
+      addrs: "A group: foo bar <foo@bar.invalid>, foo <ghj@foo.invalid>;",
+      otherAddrs: "foo bar <ghj@foo.invalid>",
+      expectedResult: "A group: foo bar <foo@bar.invalid>;",
+    },
+    {
+      addrs: "A group: foo bar <foo@bar.invalid>;, foo <ghj@foo.invalid>",
+      otherAddrs: "foo <foo@bar.invalid>",
+      expectedResult: "A group: ; , foo <ghj@foo.invalid>",
+    },
+  ];
+
+  // Test - empty strings
+
+  Assert.equal(MailServices.headerParser.removeDuplicateAddresses("", ""), "");
+  Assert.equal(
+    MailServices.headerParser.removeDuplicateAddresses("", "test@foo.invalid"),
+    ""
+  );
+
+  // Test - removeDuplicateAddresses
+
+  for (let i = 0; i < checks.length; ++i) {
+    dump("Test " + i + "\n");
+    Assert.equal(
+      MailServices.headerParser.removeDuplicateAddresses(
+        checks[i].addrs,
+        checks[i].otherAddrs
+      ),
+      checks[i].expectedResult
+    );
+  }
+}