Does SmtpClient support international email addresses (IDN/Intl email) in .Net 4.0?

Asked Oct 31 '13 at 18:57

Active May 12 '15 at 07:53

Viewed 2,721 times

In .Net 4.5 SmtpClient have public property DeliveryFormat which accepts values of the System.Net.Mail.SmtpDeliveryFormat type. So I can assign DeliveryFormat value SmtpDeliveryFormat.International and sends emails to the дима@почта.рф (cyrilic email address). But my current project supports only .Net 4.0 (customer restriction). In .Net 4.0 SmtpClient haven't both SmtpClient.DeliveryFormat property and SmtpDeliveryFormat type at all.

Now when using cyrilic emails I'm got an error: The client or server is only configured for E-mail addresses with ASCII local-parts: дима@почта.рф.

I'm using SendGrid service for sending emails - it supports IDN addresses (http://sendgrid.com/docs/Marketing_Emails/recipients.html). Does this mean that I can't send emails to the IDN adresses using .Net 4.0?

edited Oct 31 '13 at 18:59

asked Oct 31 '13 at 18:57

Dmitry Bykadorov

I think you have the answer. No, it doesn't. – Adriano Repetti Oct 31 '13 at 19:01
Yeah... It seems that I'm dreaming of a miracle – Dmitry Bykadorov Oct 31 '13 at 19:31
Yes, it's made according [RFC 5322](http://tools.ietf.org/html/rfc5322#section-3.2.3) and it allows only 7 bit US-ASCII characters. I never tried (and who knows how server will answer) but you may try to encode that characters as you may do for subject (according to RFC 2047). – Adriano Repetti Oct 31 '13 at 19:52
Let me know if it works, I suppose, because it's not standard, it's not supported by servers. – Adriano Repetti Nov 01 '13 at 08:33

Does SmtpClient support international email addresses (IDN/Intl email) in .Net 4.0?

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