I took a look at your website. Very neat and straight forward. In answer to your question, I have to refer to a product I'm familiar with.For example, with the e-mail marketing service available to Office Live Small Business subscribers, you can send an informative newsletter, promotional offer, product launch announcement or company update directly to a client’s inbox. If done right—meaning you let people subscribe and easily unsubscribe to your e-mails—these communications build relationships and loyalty with existing customers, expose your business to new prospects, bring people to your website and even drive direct sales.In my opinion, I'd say you can multi-mail all those people, but please do personalize them, don't mass mail. Send an individual mail to each one of them spaced a bit apart. Then put the date on your Outlook (or other calendar) and follow up within 6 months, referencing your previous mail.If you need more information, please feel free to e-mail me, so we're not cluttering up this forum.