Sendmail access file


I read the following on

My answer to AOL’s two-tier email will be simple. Once they start doing this, this will be placed in my sendmail access file: 550 AOL doesn’t pay me to accept their email

I’d encourage others to do the same. Should enough do so, AOL subscribers might get annoyed that large portions of the Internet refuse to even accept their email.

I wanted to know how to do as suggested in the sendmail access file.
is it possible to do that at dreamhost?

Help me