Encoding of sender name using SPUtility.SendEmail

Problem:
You try add sender name to email address, send email via SPUtility.SendEmail. Sender name in email client contains bad characters starting with =?utf-8?B?.
Sample code causing the problem:

...
string senderAddress = Web.Site.WebApplication.OutboundMailSenderAddress;
string senderName = "Some name with special chars"; // you can use fe. localized web title Web.TitleResource.GetValueForUICulture(receiverCulture)

// add rows here

string sender = senderName + " <" + senderAddress + ">"; 

var messageHeaders = new StringDictionary();
messageHeaders.Add("to", receiver);
messageHeaders.Add("from", sender);
messageHeaders.Add("subject", subject);
messageHeaders.Add("content-type", "text/html");
messageHeaders.Add("charset", "utf-8");

result = SPUtility.SendEmail(Web, messageHeaders, emailBody);
...

Solution:
I think you can use SmtpClient to send email and define encoding but I want to use Sharepoint library :-).
So try to encode senderName to base64 encoding and add rows…

var utf8BytesSenderName = Encoding.UTF8.GetBytes(senderName);
senderName = "=?utf-8?B?" + Convert.ToBase64String(utf8BytesSenderName) + "?=";