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
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.