Please allow building maildrop with trashquota option. That counts even deleted mail and mail in trash to quota. Reproducible: Always
Created attachment 306209 [details, diff] adds required functionality to maildrop ebuild
note that trashquota must be enabled in both courier-imap and maildrop if it has to work properly. The support for trashquota is already in copurier-imap but was missing here. I have also filled bugreport for mail-mta/courier which includes both maildrop and courier-imap
+*maildrop-2.5.5-r1 (22 Mar 2012) + + 22 Mar 2012; Eray Aslan <eras@gentoo.org> +maildrop-2.5.5-r1.ebuild, + metadata.xml: + Add trashquota USE flag - bug #409201 +