Order of Send and Preview button on a web page/form

Question

This may seem like a trivial question but I'd be interested to hear if there's a logical or right answer to it.

Given a text box to enter data (say an email) and two buttons below it. One button is Send and the other is Preview.

Which button should be on the left and which on the right?

(Assume western left to right language.)

Answer 1

[Preview][Send]

Buttons are alphabetically arranged. that is my own option.

Answer 2

I prefer the submit button on the right hand side, that way after entering whatever data it feels more natural to move below the text you typed rather than down and to the left.