Encode Subject in asp.net mail

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Hi,

i have email service which is send to email to all users
some of the user getting below in the subject instead of correct subject

=?utf-8?B?VGhlIEZyb250IFBhZ2U6IFN0cmF0ZWd5OyBVdGlsaXRpZXM7IEJQQ0wgKEJVWSk7IEhQQ0wgKEJVWSk7IEdTSyBDb25zdW1lciAoQUREKTsgT2lsIEluZGlhIChCVVkpOyBIYXZlbGxzIEluZGlhIChCVVkpOyBCZXJnZXIgUGFpbnRzIChCVVkpOyBQYWdlIEluZHVzdHJpZXMgKFJFRFVDRSk7IFRhdGEgQ2hlbWljYWxzI

have used below code line in the email.

C#

mailObj.SubjectEncoding = System.Text.Encoding.UTF8;
mailObj.BodyEncoding = Encoding.GetEncoding("utf-8");
mailObj.SubjectEncoding = Encoding.GetEncoding("utf-8");

Pls do the needful.

Posted 22-Nov-15 18:30pm

manish_rcc

Updated 24-Sep-20 21:55pm

Suvendu Shekhar Giri

v2

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Sergey Alexandrovich Kryukov 23-Nov-15 1:39am

So what's the problem? This is correct subject, according to one of the mail-related standards/RFCs. This is UTF-8 encoding represented as base64 string. Perhaps "some of the users" use some stone-age mail application. Send a message with some Unicode characters to yourself and check up its presentation in your mail application.
—SA

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Member 14948305 · Answer 1 · 2020-09-24T21:55:00

Solution 2

Adding two whitespaces to the subject worked for me. Don't ask why.

var mail = new MailMessage(from, to);
mail.Subject = subject + new string(new char[] { '\u2000', '\u2000' });
mail.SubjectEncoding = Encoding.UTF8;

Posted 24-Sep-20 21:55pm

Member 14948305

Sergey Alexandrovich Kryukov · Answer 2 · 2015-11-22T19:46:00

Please see my comment to the question.

Here are the references for you:
https://en.wikipedia.org/wiki/Unicode_and_email#Unicode_support_in_message_header[^],
https://tools.ietf.org/html/rfc6532[^].

See also:
http://stackoverflow.com/questions/454833/system-net-mail-and-utf-8bxxxxx-headers[^],
http://stackoverflow.com/questions/16255487/encoding-to-utf-8-in-email[^],
https://social.msdn.microsoft.com/Forums/en-US/67414337-19a6-4128-b1a0-212404cc2cb1/bug-in-systemnetmail-net-4?forum=netfxnetcom[^],
https://social.msdn.microsoft.com/Forums/en-US/b6c764f7-4697-4394-b45f-128a24306d55/40-smtpclientsend-attachments-mit-umlauten-im-dateinamen?forum=dotnetframeworkde[^].

I doubt you need to do anything about it, but better check it up: send a mail message to yourself using some header with Unicode characters, see how it's rendered by different mail applications…

—SA