Digest...
Unlike the internet and web browsers, which have made huge strides in the last few years to make design and development an easier, more consistent process, the email client landscape is stuck in the past. While there are only a handful of major web browsers, there are dozens of popular email clients, each with their own rendering engine.
Since each email client renders only a fraction of the HTML and CSS that email designers typically use, the same code can often appear broken across different programs or apps. This leads to an equally broken experience for subscribers and the potential for decreased engagement and conversions. In extreme cases, subscribers will get fed up and unsubscribe, leading to broken trust in your brand.
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We use Litmus all the time, and it's for the reasons above. Email developers need to hack their way to improvements constantly, and it's the dirty little secret in Marketing Automation that relies so heavily on email communication. Litmus embedded in your MAP is well worth the additional expenditures.