This means that you will need reduce the number of recipients. Please break them into groups of smaller size such as 20 and then try sending it.
Since this is a personal, non-commercial e-mail address there is no other solution as far as i know. If you upgrade to a professional account, only then you will be able to have increased limits.
Hello there you will have to use a bulk emailer programme to send out emails to multiple recipients. Here is a free one that I use and it works very well>Here is another bulk email sender