[ILUG] blacklisting address

[Jason Corcoran]

I have been receivig a lot of backscatter emails for variations of 3 email address that I never use on my domain.

What is the best way to blacklist them?

As am example I seem to  be getting return emails for

dev at example.com
2dev at example.com
Sdev at example.com

And one final point dev is a user on the machine, i.e. the emails are
delivered to dev, but I do not use dev as a email address.

Thanks,
Jason.