As said below, the privacy email will definitely work, that's how I've obtained domains in the past. Whether they answer or not, is a completely different story :)
I just tried to email to the Registrant Mail and...
* ATTENTION *
This email is being returned to you because the remote server would not
or could not accept the message. The registeredsite servers are just
reporting to you what happened and are not the source of the problem.
The address which was undeliverable is in the section labeled:
"----- The following addresses had permanent fatal errors -----".
The reason your mail is being returned to you is in the section labeled:
"----- Transcript of Session Follows -----".
This section describes the specific reason your e-mail could not be
delivered.
Please direct further questions regarding this message to your e-mail
administrator.
* ATTENTION *
This email is being returned to you because the remote server would not or could not accept the message. The registeredsite servers are just reporting to you what happened and are not the source of the problem.
The address which was undeliverable is in the section labeled: "----- The following addresses had permanent fatal errors -----".
The reason your mail is being returned to you is in the section labeled: "----- Transcript of Session Follows -----".
This section describes the specific reason your e-mail could not be delivered.
Please direct further questions regarding this message to your e-mail administrator.