How to include email addresses within a file and then send a message by using that file in the Unix bash shell script?

In the Unix bash script, how can I create a file with some email addresses and then use that file to send messages through Unix bash shell script?

For example, I would like to send my message to: person1@yahoo.com, person2@yahoo.com, and person3@yahoo.com  

How above email addresses need to be entered in the file "mailfile.txt" and what would be a command to send "mailfile.txt" in the Unix bash shell script?

I tied to enter email addresses in the "mailfile.txt" the following way:
person1@yahoo.com, person2@yahoo.com, person3@yahoo.com

then I tried to run below sript:

mailSubject="ERROR: Module10 - FAILED, REVIEW Program LOG"
mydir=/year/month/week/day
mymail=$mydir/mailfile.txt

     (echo "----------------------------------------------------------------"
      echo "Module10 Update Program"
      echo "ERR Msg: Module10 failed review program LOG"
      echo "----------------------------------------------------------------") | mailx -s $mailSubject $mymail

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No errors are produced and no mail has been send to those three recipients.