Pistachio Email Templates - Delicious newsletter templates built for automation
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Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
SendX.io - SendX (https://sendx.io) provides remarketing and retargeting tools for web businesses. You can use popups, landing pages, email, web push notification, automation workflows and FB / Google retargeting to drive more revenue.
Startup Emails - Responsive HTML email templates for startups
Mailblast - Email marketing on a budget using Amazon SES