Think twice before you do it again. Why? Here at Architel we spend a lot of our time getting our client’s URLs (i.e. our URL is architel.com) removed from blacklists. Sometimes their domains are added in error, but more often than not someone who works for our client has sent out a large email blast to 100+ or even 1000+ email addresses. More and more spam filters are able to identify ‘email blasts’ as SPAM and more and more often these filters are adding the source URL to real time blacklists. More than 80% of the email blasts our clients send violate Federal law (specifically the CAN-SPAM Act) and put the business owner at risk of a five year prison sentence (don’t worry, I don’t think anyone has gone to jail yet). Finally, these email blasts can crash the company’s Exchange server or get sent in error over and over filling your client’s email boxes. Trust me, this is a not something you want to do!
How can you send messages to your massive 100+ list of email addresses? If you must, you should use a service that specializes in handling email blasts. What should you look for? Pick a service that:

• Mail-merge personalization
• Message Scheduling
• Forward-to-a-friend
• Assure CAN-SPAM compliance
• Open and Click-through tracking and statistics
• Bounce-back Handling
• Subscription Management
• Online Newsletter Editor (and or templates included)
• List segmentation
• Multiple message autoresponder
• Integrated surveying
• RSS feeds
• Event Management
• Public Newsletter Archiving

Before we started blogging we sent out a periodic newsletter to around 4,000 people using a service owned by Microsoft called ListBuilder. Microsoft discontinued the service soon after we made the decision to stop sending out newsletters. There are lots of companies that offer ‘email marketing’ services, but if you are lazy and just want to take my word for it I would try Intellicontact (it is free to try).