I'm very pleased to announce that MimeKit ( https://github.com/jstedfast/MimeKit) now supports DKIM-Signatures (as of v1.2.4) thanks to crypto support from BouncyCastle!
I am so glad that I discovered BouncyCastle when I was looking to implement cross-platform S/MIME and PGP support for my email framework for .NET. Many, many thanks to Peter and everyone else who has contributed to BouncyCastle. My goal for MimeKit and MailKit is to make the world's premier email framework for .NET with full support for the privacy extensions and BouncyCastle is helping me accomplish this. Thanks, Jeff