How to send emoji unicode characters in the subject? [closed]

Question

I'm trying to send a message with a subject that contains Unicode symbols.

When I try to send such message from my Gmail account, the subject is displayed correctly and the subject header looks like this:

Subject: =?UTF-8?B?8J+OgVByZXNlbnRzIfCfjoE=?=

However, when I send such message via Mail.dll the subject gets corrupted and is displayed with question marks instead of unicode characters. The subject header looks like this:

Subject: =?utf-8?B?77+977+9UHJlc2VudHMh77+977+9?=

Is there a way to change this behavior of MailBuilder so the unicode characters in the subject stay untouched?

Answer 1

Mail.dll correctly encodes all utf-8 characters. Internally Encoding.Utf8.GetBytes is used and the result is encoded using base64 or qp.

How does your code look like? Are you using correct encoding for your c# code file?

Comments

Our production code uses values from database to fill the subject. We know these values are stored correctly because when we output them on a web page they are displayed the way they should (as unicode characters).

I was able to reproduce the problem with this piece of code: http://pastebin.com/QdXL3qQe

The encoding of the C# file is Unicode with BOM. It shouldn't matter though because the problem persists even if I use unicode escape sequences in string instead of the symbol like in this sample: http://pastebin.com/5H743N4D

If you decode the mime headers from both of these EMLs you'll see question marks instead of pictures.

---

What is the Mail.dll version you are using?

---

We're using version 3.0.13264.1223 judging by the assembly file properties.

---

You are correct, it is a bug. I was able to identify it and know how to correct it. We'll provide a fix next week.

---

Thanks, how will you let us know? Will you just add a comment in this thread?

---

Exactly. We'll add a comment here.

---

It has been corrected. You can download the latest version here:
https://www.limilabs.com/mail/download