OK, that does make sense so far. Today I have checked, and the correct dates seem to be showing up now after the initial date (ever since that initial run of the "dovecot expunge" command was run on all mailboxes). So in our case I have the expunge set to delete older than 30 days. I assume if I wait 30 days from now, it will start working?

Yup. If you run your script every day (and thus, run "doveadm fetch ... date.saved" as well), that will make sure any new mail put into your Trash folder will have date.saved within 24h of the "real" value.

Joseph Tam jtam.home@gmail.com