Completely remove old revision of file

[jason . chancellor]

I'm the admin of an open source application and accidently checked into
CVS a file with my smtp email and password listed in a config file.

Realizing my mistake I changed the config file to not have my email and
password in there and checked it back in,  but if someone was going
back through older revisions of the config file they could stumble
across this information.

Is there a way to wipe out an old revision of a file from CVS so no one
could ever stumble across this data?

Thanks.