Simply emailing the form will not allow you to collect data from a remote source as the form will not be bound to any table.
You could get your external source to submit the required data via an Excel spreadsheet and then import that into your DB.
Another method might be to supply your external source with a DB that allows them to enter the data, into their copy of the DB and then on the press of a button exports the data, you require, to and Excel spreadsheet and email that to you for import into your copy of the DB.
If you are using Access '10, I believe that you may be able to set it up so your external source can access the DB over the Internet (I have not used Access '10, so have no knowledge of how this works).