Mailmerge and attach to Outlook

Hi,

I have a problem in "Mailmerge and attach" to Outlook. When I click "send e-mail message" in Word document, it automatically attaches and sends the e-mail via outlook.

But I couldn't type the message content or signature.

Attached is the sample word doc and address list.

I have heard of third party softwares, which I am not interested. Is there any way we can do with macros or by any other way.

Please help.

Thanks,
aganesan99