Help Please

As a new developer you are going to need to get a clearer idea of what happens on the Client and what happens on the Server.  ColdFusion is a server technology.  It runs on the server behind the web server (IIS, Apache, etc).  A client makes a request to a web server.  If the request is for a resource the web server has been configured send to ColdFusion it fowards the request.  ColdFusion processes any dynamic instructions (CFML) found in the requested file, builds a response (HTML, JavaScript, CSS, XML, PDF, an ever growing list of outputs) and returns this to the web server.  The web server sends the response back to the client.  The Client then does what it is built to do with the request, i.e. render HTML, execute JavaScript, apply CSS directives, pass the PDF file to a plug-in, etc.

So it is unclear from your request to "set a variable" to a table cell and extract the data from the cell what you are trying to do on the server and what you are trying to do on the client.  It would be very easy to set the content of an <td></td> tag set to a value of a variable before that HTML markup is sent back to the browser.  It is no more difficult to also use that value in an email.  But if you are expecting the value to somehow be generated or modified on the client and that trigging all these actions, that is not so easy and will take sometype of request|response communction between the client and server.

A silly example of the first, simple option:

myFirstCFML.cfm

<cfset variables.aVariable = "Look at me ma, I'm using a variable">
<table>
  <tr>
    <td><cfoutput>#variables.aVariable#</cfoutput></td>
  </tr>
</table>
<cfmail from="an.Address@email.com" to="my.Address@email.com" subject="testing one two three testing">
#variables.aVariable#
</cfmail>

P.S.  It sure is encouraging to see so many people new to ColdFusion showing up these days.  Kind of puts a damper on those "ColdFusion is Dead" diatribes one runs into here and there.