Are you looking for a good Email Service Provider (ESP)? If you are running an email campaign and are considering finding an ESP to replace Constant Contact you may want to consider some other available options. Email Service Prodivers handle email list management and issues relating to mail delivery and functions of CAN-SPAM laws such as templates and automatic unsubscribes. ESPs have html templates for emails some of which include responsive templates so emails can be easily read on smartphones and tablets.
Groundwire Labs published a 2012 review of Email Service Providers accessible here: http://groundwire.org/labs/email-publishing/2012-email-service-providers
The list of ESPs reviewed include:
Other Enterprise and Small Business Providers
Salesforce Mass Email
Drupal Camp Twin Cities gave a presentation on responsive html email design using Drupal with slides posted online laying out how to create and format your own responsive html email campaign using Drupal.
Email Service Providers are extremely useful for running a successful email campaign. Groundwire Labs reviews of ESPs should help you find the perfect ESP to fit your needs and preferences. If you are interested in learning the finer technical points of creating an email campaign be sure to check out the online resources at Drupal Camp Twin Cities.