SmtpJS is a free-to-use, simple script that can be embedded into your webpage for you to be able to send emails via JavaScript. Let's say your website wants to send an emoji email to the provided email by the user. Here's the code I use for this example, I use Tailwind CSS for the styling.
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About SmtpJS.comStep 1: Getting StartedStep 2: Create FormStep 3: Send EmailResultConclusionSort: