archivemail is a tool for archiving and compressing old email in mailboxes.
It moves messages older than the specified number of days to a separate mbox format mailbox that is compressed with gzip. It can also just delete old email rather than archive it.
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Enable snapd
On Debian 9 (Stretch) and newer, snap can be installed directly from the command line: