[exim] noreplys...

Hi,

I am trying to handle our noreply emails a little bit more properly.
We do send the classic "Something new... check your account" emails coming from noreply@???
So far, I used a simple: "noreply: :fail: This account is not valid, use the website mail" in the /etc/aliases
It seem to work, but it is not very aesthetic. I would like the response to be clean (multiple lines of text, etc...).
So, is there a better way to handle noreplys from within exim.conf?

Thx,
JD

PS: I am not very experienced with exim syntax yet...