Please double-check that your e-mail address is correct and reachable! Do not type your address, copy-paste it from your mail program. If an incorrect address causes my reply to bounce back with an error, it is just a waste of everyone's time.
I have fluent knowledge of English and Dutch (Nederlands) and decent knowledge of French and German, and also basic Mandarin (汉语,) so you may write in any of those languages but please try to write understandably. It does not need to be perfect, but it would be helpful if there would be a bit of structure in your text, like basic punctuation. If you use an automatic translator, please also include your original text no matter what language it is, it might be helpful.
If you get a “Precondition failed” error, the server probably thought your message is spam because you used an unlucky combination of words. Try to re-formulate your text if this happens.
Do not forget the warning about the ‘Weird stuff’ section of this site.
Don't bother asking anything related to legally dubious or criminal activities — I won't even reply.
About the carbon copy: this is a best effort only. It is very likely this copy will end up in your spam folder, or just never arrive at all. The reason is that it will be sent with your own address as sender. This is of course to avoid that anyone could abuse this mechanism to obtain my e-mail address. You will only ever see my address if I reply personally.
“Dude, where's my reply?”
Here's a list of recent mails to which I tried to reply without success. If you expect a reply but don't get one, be sure to re-check this page after a week or so.