[Exim] Ignoring bounce messages to alias - How?

Two questions:

1)
Is there any way I can ignore bounce email messages sent to an alias?
This alias is only supposed to receive email so no bounces can ever be
generated. Must be those damn spam and virus programs co-opting the
alias email address. Also, since it is an alias, no account and hence no
".forward" file. If filtering is the way, how to do filtering for the alias only?

2)
Is there any way to distinguish genuine bounces to any address against
the fake ones generated by spam and viruses co-opting one's email address?


Thanks,

Guru