Mostly performance benefits that JMAP enables, and masked email addresses feature for example. - https://www.fastmail.com/blog/how-and-why-we-built-masked-email

Mostly performance benefits that JMAP enables, and masked email addresses feature for example. - https://www.fastmail.com/blog/how-and-why-we-built-masked-email-with-jmap-an-open-api-standard/ https://www.fastmail.com/blog/how-and-why-we-built-masked-em...