Microsoft Outlook question

Hello everyone,
I have a question I hope somebody can help me with. My company requires a confidentiallity statement added to my mail signature for all outgoing mail. I have that set up.
My question is....The way I like to attach a file to an e-mail is by right clicking on it and then using the send to mail recipient option.
When I do this however, my signature does not appear with the confidentiallity statement. Does anyone here know how to set that up so it will transfer my signature if I use the send to mail recipient option?

Thanks!!

Hi, what email client you using ? Outlook o Thunderbird or something else?