MultiMail is a suitable tool for sending bulk emails to specific lists of recipients.
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MultiMail can help you send an email message to a large list of recipients, but unlike other similar programs, this application is very simple to use. The program requires that you connect to your Gmail account by providing the email address and password, as you would login to the service from the browser. Type your email address in the top field, then fill in the email subject, add attachments, if required and the body of the message. The recipients are imported from text files stored on your computer, so you can easily modify them if you wish. You can easily load a different list within seconds, to send a separate message.