The safest way to contact me is by e-mail. You can reach me at wilson@netwhatever.com, which is my personal address. Failing that, you may try my old work address, wilson@terra.com.br, but that one is more heavily spam-filtered, so I can't guarantee you will get through. You can write in any language you like, but if it's not English, Portuguese, Spanish or other closely-related languages, I'm not sure I'll understand you. I'll try, anyway.
If you need to contact me by snail-mail or phone (or in case you want to send me a Christmas or birthday gift), send me an e-mail and I will send you the address and/or phone number to call.