Question

I have a c# application that uses the standard MailMessage and SmtpClient classes to send emails. This works fine and great. However, we have recently uploaded data from a government agency and some of the email addresses contain french characters. eg Hélè[e-mail]

When I send an email to the french email address I get the following exception:

an invalid character was found in the mail header: é

My questions are :

• Is it possible to use c# to send an email to an address containing french accented characters?.
• If yes, then How?

Answer 1

Url encoding of the french character é is

%E9

You can use:

HttpUtility.UrlEncode("é", System.Text.Encoding.GetEncoding("ISO-8859-1"))

Which gives the correct encoded output: %E9