I think it would be very useful to have a user's GID in a variable.

So i could use for example: mail_attachment_dir = /srv/mail/.SiS/%{gid}

I use one GID per domain and the aliases fqhns of the domain. When for example example.com would be an alias for exmaple.net (gid: 12345), the attachments would be stored inside /srv/mail/.SiS/12345/, no matter if a message was sent to john.doe@example.com or to john.doe@example.net.

"quota = dict:domain:%{gid}:proxy::quota" would then also work.

Regards, Pascal

The trapper recommends today: c01dcofe.1134217@localdomain.org