First you decide what source of emails you want boosted:
Plain-text and HTML
Then Email Booster will:
Analyze your email Subject and tell you how to improve it. It even checks against a massive database of words that can either help or hurt your conversions.
Make sure your email Body is up-to-snuff with no bad code, enough content to not be flagged as Spam, and contains a mailing address (also less likely to be Spam)
Check that your hyperlinks are valid.
Scan your email with SpamAssassin (the best spam-prevention tool out there).
Ensure your images are as optimized as possible and contain proper descriptors (in case they can't be loaded in an email client).
Lightweight Marketing Automation That Doesn’t Suck!
Drip allows you to craft every interaction with your leads, trial users and customers like an artisan.
About Campaign Monitor
With Campaign Monitor, you can easily attract new subscribers by sending them beautiful email newsletters. Built from the ground up for creative professionals, you can manage all your clients from a single account and let them send campaigns at prices you set.