Subject encoding on SmtpClient/MailMessage
I am trying to send emails that contain non-ASCII characters using the SmtpClient and MailMessage classes. I am using an external mailing service ( MailChimp ) and some of my emails have been rejected by their SMTP server. I have contacted them and this is what they replied: It appears the subject line is being Base64 encoded and then Quoted-Printable encoded, which generally should be fine, but one of the characters is being broken across two lines. So when your subject lines are a bit longer, in order to be processed correctly, it's broken on to two lines. When using UTF-8 quoted printable