Marcie,
Go Daddy had limit of 250 email a day normally. According to several forum post but as of lately they have dropped that to 100. here is a link
http://help.godaddy.com/topic/168/article/313
also this from one of the members. as of 5 Dec 2011.....
"Very good! THANK YOU!!!!
As a 12 year veteran of godaddy it was easier getting an intelligent answer here, from you, than from godaddy. (I sent an email...but no reply after several hours...)
Have learned from many years *never to call godaddy support at night*. The rude children there don't like to be disturbed from their video games or whatever they do...
YOU WERE ABSOLUTELY CORRECT! It is a godaddy server error.
All my email accounts have relay limits of 250. In the past (that being 2 years ago) I could send 250 emails a day/address. Have a list of 900+ to send to.
NOT NOW! Godaddy returned a server error - 553 Sorry, too many recipients...when sending 200 names in the bcc;, then tried 100...same no-go.
Came here and read your brilliant helpful posts and found the solution. Sent 43 from one email address - no problem.
Conclusion? Godaddy got cheap. 250/day is fiction."
Hope this helps