Recently the great support folks at FastMail helped me to debug a rather irritating issue where emails that had languished in my inbox for too long, and were then processed by me to end up in the Archive folder, would get the date of archival assigned as the main email date, instead of the date of arrival. For example, an email with a date in November of 2020 would get a new date of say February 21, 2021, if that’s the date that I finally got around to it and moved it to the Archive folder.
