Learned how to make responsive HTML Emails from scratch using HTML & CSS. What's next? : <p>Looking at jobs online most of them have: Experience using MailChimp or Oracle responsys.  Are these what most HTML Email developers use at work?  </p>

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<li>Also I tested my code using the free <a href="https://putsmail.com/tests/new" rel="nofollow noreferrer">https://putsmail.com/tests/new</a> on gmail and hotmail apps (iphone)</li>
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<p>They both looked great.</p>

<p>Is that enough? If not, what website is the best for testing to make sure it works well on every email clients?</p>
