I sign and encrypt emails with PGP, which means my emails have a signature attached verifying that the message was sent by me and not somebody else. This signature is often shown by mail clients without PGP as noname because the attachment doesn’t have a filename. Please download my key from here or from any SKS OpenPGP Keyserver, and do get in contact if you would like to exchange signatures.

For more information on PGP, I recommend the following pages.