System.Net.Mail.Tests.MessageHeaderBehaviorTest.Message_WithXSenderHeaderSet_ShouldNotOverwriteXSender C# (CSharp) Method

        public void Message_WithXSenderHeaderSet_ShouldNotOverwriteXSender()
        {
            _message.Headers.Add("X-Sender", "[email protected]");
            _message.From = new MailAddress("[email protected]");
            _message.HeadersEncoding = Encoding.UTF8;

            _message.PrepareEnvelopeHeaders(true, false);
            _message.EncodeHeaders(_message.Headers, false);

            Assert.Equal("[email protected]", _message.Headers["X-Sender"]);
        }