[AvAn12]

Great feature! Would love to see this in Outlook (only option at work), gmail and others. Is this proprietary or some kind of extension of the email spec? Cheers

[slightwinder]

[..]You’ll find them in the Memos folder, as a reply to the message your memo is attached to.[..]

Seems they are just normal mails in a special location. Shouldn't be that hard for other clients to implement this.

[geniium]

The implementation is indeed simple: the problem is standardization.

[AvAn12]

PS I'm a long-time user of FastMail for personal. Highly recommended!

[unshavedyak]

Same! I adore their masked emails and email aliases, and that it integrates into 1pass during signup. Really great UX for email