Does quantitative easing appreciate or depreciate the domestic currency?
The exchange rate can be expressed in a simple classroom monetary model as:

$$S = \tilde{m} - \psi \tilde {y} + \lambda (\tilde i)$$

Where $S$ is the exchange rate $m$ is log of money supply, $y$ log of real output $i$, interest rate, $\tilde{}$ denotes differences between variable at home and abroad (i.e. $\tilde{x} = x_{home}-x_{foreign}$), and $\psi$ &amp; $\lambda$ are just model parameters.

So the exchange rate depends both on log of money supply and on interest rate. Furthermore the interest rate itself depends on money supply. 

The answer of @410gone focuses on the first order effect of monetary expansion through changes in $m$ whereas the answer on Quora mentions only the effect monetary expansion has on exchange rate through $i$.

However, the Quora answer omits any discussion of other effects, whereas @410gone mentions there are other effects so I would say the @410gone answer is more correct in a sense it mentions that also other effects exist whereas the Quora answer pretends that increase in money supply only affects exchange rate through the interest rate.