FastMail&#x27;s &quot;why&quot; is better explained in a post from last year, &quot;JMAP -- A better way to email&quot; [0].<p>[0]: <a href="https:&#x2F;&#x2F;blog.fastmail.com&#x2F;2014&#x2F;12&#x2F;23&#x2F;jmap-a-better-way-to-email&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blog.fastmail.com&#x2F;2014&#x2F;12&#x2F;23&#x2F;jmap-a-better-way-to-em...</a>