Do you need to send offers, anouncements about updates or changes? Do you need to send a message to multiple email addresses? Don´t you want every recipient to see addresses of other co-recipients? Don´t you want to rely on only insertion recipients list in copy (hidden)?
There needn´t to be only difficult and expensive webservices in marketing, but also relatively cheap however very effective software for collective sending of messages. SendMails is a handy tool that offers you the possibility to send personalized messages.