If you can see the fonts, then the problem isn't at your end.
Case in point, これが読めないか？
If you could see the characters, it's because you have a font that supports Japanese installed (and lq.org's server sending pages in utf-8). If not, then it's not a problem at my end. I was able to type a sentence in Japanese and I can see the hiragana and kanji, because my computer is set up for it. Likewise, if you can see the turkish script when you're typing the e-mail, but your friend can't see it, it's because your friend doesn't have an appropriate font installed. If you want to be 100% sure, use UTF-8.