Sending bulk emails is the quickest way to get your entire company added to the SPAMMERS LIST. You should NEVER send bulk emails using your personal email account. That goes for any email system from any provider.
There are a number of really great, cost effective programs you can use to send out your newsletters and bulk email announcements. They are very INEXPENSIVE and are well worth the $10-$15 a month you will spend.
It is cheap, easy to use, and widely accepted as an industry leader.
Probably The Most inexpensive solution for bulk sending.
A bit more advanced but offers a lot of functionality