From your question, what I can understand is like you would like to email for all the recipients at the list of Excel sheet at one go. If so, you can use Google Spreadsheet for that purpose. How? You may use Excel sheet's data / email addresses copy to Google Spreadsheet and make recipient list in a particular row. After that, follow the steps given below.
Go to the Mail Merge menu option in the Google Sheet
Click Initialize to authorize the program
Select 'Start Mail Merge' from the same menu
Select Gmail draft template you just created using the drop-down option.