We've recently introduced a new Campaigns section into ShiftMail.
Campaigns are a powerful tool to send regular, personalised emails to your subscribers.
When creating a campaign you can use an existing mailer or a URL for the email content. You can then define some simple rules to determine when your subscribers will receive them.
These are the sorts of things you can do:
Providing you have a detailed database you can be very specific with your criteria e.g.
A credit is deducted for each email that goes out. You will be notified if/when you run out of credits.
To get started just click on the campaigns section within ShiftMail.