How can I have checked by default to R?
Acutally I don't even need Y option - R by default without a checkbox would be a fine default behaviour.
It's okay if the checkbox stays - but the default should really be R not Y.
Else too many users might after some time - receiving many emails they are not interested in - send the emails to spam.
Also a hack would be fine for a start.
The default of setting N is not good either - because many people simply don't notice that they need to check the box, but the are expecting reply by mail...