email client signature with Confidentiality Disclaimer

Hi

We are having linux zimbra mail server most of our users use ms outlook as thier email client, now the management has informed to IT to add the signature for all the users with the “Confidentiality Disclaimer” at the bottom of the email, futher management says this Confidentiality Disclaimer text should get applied only if the recipient belongs to other domain and this should not get applied for users of the same domain.

for you information the below is the Confidentiality Disclaimer

Confidentiality Disclaimer: This e-mail and any attachments are confidential and intended solely for the addressee and may also be privileged or exempt from disclosure under applicable law. If you are not the addressee, or have received this e-mail in error, please notify the sender immediately, delete it from your system and do not copy, disclose or otherwise act upon any part of this e-mail or its attachments. or its affiliates does not accept responsibility for any loss arising from unauthorized access to, or interference with, any Internet communications by any third party, or from the transmission of any viruses. The contents of this message may not necessarily represent the views or policies of < company name> or its affiliates.

2, in addition to the above i have one more doubt i,e we are into selling the apartments hence we have marketing/sales and customer care departments. I really do not understand does this above Confidentiality Disclaimer small paragraph makes any sense for these departments, I feel this should be for accounts or finance deparments however iam not sure hence please let me know is it recommended such Confidentiality Disclaimer or should customize it to something valuable key words for marketing /sales and customer care departments, please suggest on the above 1 and 2

Thanks and reagrds
d_wathi