Although you can use different formats for email templates, HTML is one of the most popular to use. Friendly to most email providers, HTML templates are easy to use and incorporate in your email marketing campaigns.
Fortunately, there are many online sources to find HTML templates for download, whether for free or purchase. Email Template Pro is a great place to start. It offers free downloads as well as premium templates.
StreamSend is another trusted option. It will build a customized template that can feature your company logo, colors, images, and anything else to suit your needs.
Many other sites are out there as well. CampaignMonitor.com has templates available, as does ConstantContact.com. These sites have hundreds of HTML templates and designs available that will fit any purpose. Dozens of sites out there have templates, and HTML is one of the best choices for your campaigns.