I have a message with:
Content-Type: text/html; charset=koi8-r
Does your product support this encoding?
Yes, Mail.dll supports this charset correctly, both processing email messages and creating and sending emails.
In both cases you'll use regular .NET strings.
You can download Mail.dll email component here:
If you run in to problems just let us know.
VAT: PL 5213195875
02-707, Warsaw Poland