I prefer you to contact me electronically via eMail: sebastian@nohn.net. GPG/PGP encrypted mail is welcome and favoured. My public key ID is 0xD47D55E0.
Don't expect me to answer your message immediately.
German law requires me to put this information on my site:
As already said, this information is required by law, don't expect me to answer your phone calls if you don't send a caller ID.